As Becky and a lot others said, there are so many aspects to count on, but one thing is sure: Richie is a more complete mucisian then Jon, his one of the most complete guitarplayes our days, and most importand he konws howe to perform live.
Would we have a "wanted", if Richie wasnt one of the boys? I don't think so, and what would a BJ show be like without Wanted?
An other thing is that Richie is much more imaginative then the other goys, just take a look on the "Live in London" DVD, these solos are something he makes up for that show special.
And Jon and Richie as seperated? Of course Jon would have maked records. But fore me it's sure that Richie would have got longer, he is just more complete, specially on a guitar. But he would never have been the frontman Jon is, so to me that battle is unsettled

:=)