I think DesignerAnalyst supplied great reasons for each choice you'll eventually choose. But I would like to add some Cognitive Psychology aspects.
The Prospect Theory yielded a s**t-load of effects/biases/heuristics, 2 of them are relevant here: the Status Quo Bias and its brother the Default Bias (aka the Habitual Behavior). Both of them are relying on the "ease" of mental/cognitive load when making choices. Mark Zuckerberg uses it, as he claimed to have only 1 type of jeans, and 1 type of shirts that "takes off his morning considerations when standing in front of his closet".
Another great example comes from organ donors; It's easy to (mistakely) assume that countries with more organ donors have tons of "great people" living in, and everybody is super nice and happy and just want to donate organs to help everyone else. Well, the hard truth is that these people in those countries (with high organ donors percentages) have no special traits that makes their citizens more "humans" then countries with fewer organ donors. It's simply a matter of the country's default choice about donating organs or not... Countries with higher numbers of organ donors are the ones that upon asking their citizens if they wish to donate organs or not already chose "yes" (checked the checkbox or whatever) for this person. In face, in order to NOT donate organs this person had to un-check the checkbox (or state "NO") and as the Default / Status Quo biases predicted - people rather do nothing than just do it. And yes, it was a reference to Nike :)
So just to quickly answer your question - it depends on the common need (sending messages to many/few people), or the business need (you want everyone to send the messages to as many people as they can, or the opposite).