i still have a classic avatar, but mostly wear mesh clothing on it.
I find that on a dsl connection, mesh avatars just dont rez for me, unless i hang around for about 5 minutes, (seriously).
Maybe if you have cable the rez times are different.
It is totally up to you if you want to have a classic avatar, mesh avatar, or even a furry or whatever, personally i find the japanese furry avatars are cute (i think they are the kemono ones), but i think you will find there are still lots of classic avatars out there on the grid, although they could be more alt acount ones nowdays, i am not sure of that.