I don't like the Lite skin. It's too bright to my taste.
I could do with the Classic, but almost all the new features we design are meant for the V3 skin. If we had to do them for all 3 skins, it would be three times the work which is nearly impossible for one single man (yes, I'm a man.)
So I use v3, which I find sooooo much better than the other two. Much more beautiful, the colours are so well balanced, it's easy on the eye, all the features are there... The GBAtemp v3 is the best IPB skin I've ever seen, TBH. But I guess I haven't seen a lot.