PSUAthDifferent cubes have a different feel to them and may also have slightly different functionality. It simply is a matter of personal preference.
It is similar to running shoes for runners. Every shoe has essentially the same function (protect and support your foot while running), but different runners prefer wearing different shoes.
For me personally... the MoYu AoLong V2 is my favorite cube ever. BUT, I haven't gotten a chance to use the MoYu AoLong GT yet, so I'm going to use this drop to pick that cube up.