Sweet guitars

neither, jem=overpriced RG. get an RG1570 and put dimarzios in it, and magically, you have a jem without the gay monkey grip. and if you're a faggot, you can add the monkey grip yourself.
 
for me, definately the Vai.. I got a JEM and I love it.. I played a Satch model twice and I didn't like it that much.

But just try em both and see how you like them
 
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