In some cases, as
No is the default option for a radio button, should it be placed first instead of
In my opinion, default option should be prioritized to place on left. What's your opinion?
I would like to advise you not to use Yes/No as radio buttons.
It is advised to use sentence style labels in imperative style.
Now, to answer the question in which order the options should appear, here is what MS UX style guide recommends:
List the options in a logical order, such as most likely to be selected to least, simplest operation to most complex, or least risk to most.
It's your call whether it should be Yes/No or No/Yes. But it should be consistent across the entire app. This poses a concern for your reasoning because in some places Yes might be the default option and No might be default somewhere. Even though they are both within the same page / app.
A good workaround would be to use verbs. Save / Don't save is better than Yes / No. This way it's easier to position primary / secondary actions consistently across the app. Additionally, it also helps to separate primary / secondary action using different colors.
In general, the default option should be easier to find - if your website is ltr, then this would intuitively be on the right side.
Don't save on left, save on right
I hope this helps answer your question