Both really nice guitars (I haven't seen an ss500vls in person, but Japanese Ibanez's are top-notch guitars). The floating pickups on the GB-10 are going to give you a little brighter tone, whereas the set buckers in the ss500 are probably more of what you're thinking about in a "mellow, fat, jazz tone," but with some tweaking both will get you there.
Body size will be an important consideration. The ss500 is going to have a good deal more "acoustic" presence, being wider and deeper. It's not an acoustic guitar, but you'll dfinitely be able to use it unplugged for practice around the house.
The GB is smaller and won't have as much of that, but it might be more feedback resistant plugged in. But I often think feedback resiliency in archtops is a manufactured problem, as people play jazz too loud a lot of the time. TURN DOWN!
Overall, I like the vibe of the ss500 a little better. But that's just me.
You're in for a winner. Let us know what you pick.
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