That would not surprise me since I often see symmetry listed as a fairly constant criteria for attractiveness in most human features. In practice I’m not sure how dissimilar one breast would have to be from another for me to actually notice but I’ve never seen asymmetric breasts even when my wife has tried to point it out.

All other things being equal I’d generally say bigger is better, but size is nowhere near the top of my criteria. That’s what I mean if I’m saying I don’t care about size; maybe that’s what others do too?