As what exactly?

As a vocalist, Richie is better than Joe Perry (and I'll assume better than Slash - don't think he's ever taken lead vocals on anything has he?)

As a guitarist ... well, they've all got different styles and I'm not sure I could say that one is particularly better than the others overall. Richie has gotten very lazy though, I would possibly rank him last of the three nowadays ... although hoping his solo tour may change my mind

As a solo artist ... well, I rate Stranger and US higher than anything Slash has done outside of GnR. Not heard any of Joe Perry's solo work so can't comment

As a human being ... no idea

And finally, as a maker of hot sauce, definetely Joe Perry