Agreed. Depending upon which comes by first, I wouldn't turn up my nose at either model.Condition and vintage would determine it for me.
I recommend deciding based on your usage. Do you like magnums?
I don't like magnums at all, so 15 gets my vote.
The model 14 and 15s were/are the epitome of .38 cal revolvers both in accuracy and ergonomics. Don't fight it.