If I like A more than B, as long as I can afford A, I don't really factor in is that price bump commensurate to how much more I like it better than B. Because I know I will be most happy buying what I like the most. That is what I have found personally.
I always endeavor to get what it is that I like most. If I can't afford A, however, as long as I do like B, I will get it, if it is something I need/want.