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Is it something related to tradition? Does wearing it on the left hand have benefits over wearing it on the right hand? I know that some people wear it on the right hand but not as many as people who wear it on the left hand.
Is it more usable to wear it on the left? Since I wear it on my right hand I find it easier to see the time. Does user experience affect the decision of which side is better to wear it?
Wearing watches on wrists became more prominent during World War 1 when soldiers and officers wanted to quickly know the time without going through the rigmarole of stopping to get a pocket watch out.
Wearing the watch on the left wrist allowed officers to consult their watch while writing/telegraphing with their dominant hand (their right).
Men quickly got used to the added convenience of the wrist-wear and it took to be fashionable in civilian life too.
It is a matter of:
We wear it on our less skillful arm.
It makes sense for right-handed people to wear it on the left wrist because it is easier and gives more precision to manage it (set time, alarm, etc.) with the right hand while wearing it, and also more comfortable to leave the right hand free for anything else (and I guess to avoid damaging the watch too).
On a side note I remember when I was a kid wearing stickers preferably in the left hand so they got less damaged and could last longer (I am right-handed).
Edit: @AndrewMartin gives a link in the comments to left-handed watches.
Edit 2: I found this very interesting:
Wristwatches with analog displays generally have a small knob, called the crown, that can be used to adjust the time and, in mechanical watches, wind the spring. Almost always, the crown is located on the right-hand side of the watch. This makes it inconvenient to use if the watch is being worn on the right wrist. Usually, therefore, watches are worn on the left wrist, even if the wearer is left-handed.
In exceptional cases, the crown is on the left side of the watch. This is, for example, to prevent it from digging into the wrists of golf players.
Digital watches generally have push-buttons that can be used to make adjustments. These are usually equally easy to use on either wrist.
There are a number of reasons.
Firstly: Your dominant hand can manipulate things easier than your non-dominant hand, e.g.
As more people are right-handed than left-handed, watchmakers had to pick a side to place the crown, so for right-handed people this means the crown goes on the right because this makes it much easier to manipulate with your right-hand fingers. There are watches specifically for left-handed people where the crown is on the other side.
The second reason relates to when your dominant hand is typically busy doing something (e.g. holding something, or working on/with something, etc.) your non-dominant hand is often not engaged in the same activity. This means you can view the time on your non-dominant hand without interfering with whatever your dominant hand is currently manipulating, for example, a chef stirring something with their dominant hand can now easily time how long they need to keep stirring for.
Finally to save your expensive time piece from accidental damage, you wear it on your non-dominant hand. This is because your dominant hand is used more than your non-dominant hand, so the risk of accidental damage goes up.
Further reasons. Right-handedness is assumed in this answer, because it was historically enforced.
Handwriting is easier without a watch on the wrist of your writing hand to snag on the edges of the paper.
You can check the time while still using your good hand (e.g. riding a bike one-handed is easier with the right hand; making a note of the time or date on a form you can glance at your watch without the pen leaving the paper).
I know this already has an accepted answer, but as a watch-wearing leftie, I discovered the answer to this one by unintentional experimentation: Its to protect the watch.
Until my mid 20's I used to always wear my watch on my left arm, because that's what most everyone else did. I also never had a watch in my life last more than a year and a half. The most common problem was smashed crystals.
I mentioned this to someone after I'd smashed yet another watch, and in a stupefied voice they asked why I didn't just switch to wearing it on my non-dominant arm. It took some getting used to, but I haven't broken a crystal since. Now my watches tend to die only after 5 or more years, and its usually because the electronics have fritzed out.
I don't think people who aren't used to wearing a delicate machine on that arm realize quite how much you use your dominant arm to balance, protect yourself, fling objects, absent-mindedly swing it into things, etc.
I would imagine that the crown position evolved from the standard watch wearer's position, rather than the other way around.
Traditionally, wristwatches had a leather strap and buckle - considering that ~90% of the world is right handed, it makes sense the most people would buckle their watch on their left hand with their dominant right hand. Try to buckle a watch on your left hand (if you're a righty), and see how unnatural it feels. The crown position would have evolved from this, as once worn on the left hand, it's far more convenient for the wearer to adjust a crown if it's on the outside (right side) of the wristwatch.
The crown (or other controls) are typically on the right, which makes it awkward to manipulate if the watch is strapped to the right wrist--not because the left is the non-dominant hand for most people but because your left hand would have to cover the watch or bend around it.
Whether the crown on the right came before or after the left-wrist convention, I don't know.
And interesting tidbit is that watches were one of the first drivers of mass produced LCD displays. Since most people wore their watches on the left hand, the LCD displays were biased to give the best contrast when viewed from slightly below and to the left of center. Take, for example, an older digital watch with a dark grey on light gray display and try to read it from different points of view. The dark segments will be darkest not when you're looking straight on but when you're viewing from slightly below and the to the left. This is subtle, but it might reinforce the left-wrist convention as it make the display easier to read.
[I was surprised to learn that this LCD bias was so common, that many monochrome LCD displays have the same point-of-view bias, even when they are made for something other than a watch. Go try various viewing angles with an LCD wall clock or other older bit of electronics. Chances are, you'll find the same viewing position bias. This doesn't apply to modern color displays, as they've been engineered to have a much wider viewing angle than first generation LCD displays.]
