A few things to consider...
You mention liking a flatter radius. G&L wins there, as there’s is 12” vs the 7.25” radius on the Fender.
You like the look/aesthetic of the JB-2.
The JB-2 is quite a bit cheaper.
The sonic blue JB-2 is a fairly new addition, which is probably why a) you haven’t seen people posting weight and b) it’s back ordered.
I’d bet that the Fender would have a little better attention to detail with regards to fretwork. Not saying the G&L will be bad, but I think those Roadworns get some pretty good attention at the factory.
One thing I’m not sure about but may be a thing to consider is the pickup size. For a long time, the Tribute JB-2 used the same size pickups for neck and bridge, as opposed to the slightly wider bridge pickup that the Fender would use. Not sure if that’s still the case, but it would be something to keep in mind for doing pickup swaps in the future.
To that point, Fender does have a great luxury of easily replaceable or upgradable parts, being somewhat of a standard. G&L, not so much. So, if your thought is to leave it stock, I’d lean towards the G&L. If you’re a modder, I’d go with the Fender. But I really don’t think G&Ls need mods either...