I have bought most of the men's mesh bodies. The Belleza Jake I feel is in today's market somewhat lacking. It's a nice body but could use an update and leaves me wanting more. The hud's a bit slow but no where as problematic as the hud for Legacy ( especially in a moderate traffic sim.) Legacy while it has a nice sculpt for the body and looks good. I find it's render cost to be to high to use outside of your private home, so it's impractical for daily use if you do alot of travelling around the grid or attend faires, events etc. While SIgnature Gianni may have it's own quirks, both it and the slimmer Geralt I've had alot of success with. Signatures hud is easy to use easy to set stuff up. Handles bom very nicely and both signature bodies also have omega built in. No relay required. Which is a big plus for me. Why more bodies don't do that is still a mystery but each to there own.
Aes, is one the few bodies I don't have much experience with outside of some demos so I can't give any input on it.
For terms of support , clothing , skins . Signature gianni I feel leads the pack by a signifigant margin. Followed by likely either Legacy mens , or Belleza Jake , slinks redux, then Geralt although I have seen more support for Geralt of late and less of slink. For me I like the redux system for Bakes on Mesh ( BoM) it's a throwback to early mesh days and pre mesh bodies, but sometimes old school is not a terrible thing either.