Well, I play your GV the most. So I'm torn with calling one or the other the best. Since I got the GV, my Forum has stayed at my bandmate's house. We haven't jammed at his place much since COVID hit and it was really nice to dust it off the other day.
For me, the only thing stopping me from calling the Forum the best is that it's heavy as sin.
The neck on the Forum seems like the GV neck without the wrap. Both are 35" and the unfinished quarter sawn maple feels a bit more petite than the GV. It's just the perfect 5 string neck. I have a nice Milli, too. But it's neck feels awkward in comparison.
The pickups are great. I think they are VFLs. It's 18v. And the pickup placement is just perfect. The neck pickup is slightly closer to the bridge. The shape of the pickups make for a great thumb rest, too. I had to add a thumb rest to the GV before my right hand felt comfortable.
String spacing is important on a 5 string. The Forum and GV are the same and both are perfect. I have an Ibanez fretless and the spacing is too tight. And I have a Epiphone Les Paul and the spacing is too wide.
And it's probably due to the heft of the ash body, the B sounds like the finger of God. But man, is it heavy.