First of all lukat93, welcome to JEMsite
Now I'll chip in with my advice.
1) Is the JEM7VWH (Evo) better than the JEM77BRM?
The answer to this all comes down to personal preference. They're very much the same guitar with a few slight differences. Some people prefer the fac they can play a guitar that looks exacly like the one Steve Vai plays, other people don't want their audience to think they are a Steve Vai wannabe, and so on.
The non visual differences as have been said come down really to the wood the guitar is made of, basswood or alder, and the pickups that are in them.
Overall, the JEM7VWH sounds a LOT like Evo and if you want to sound like Steve Vai, I'd suggest you get this guitar.
If you want to have a very cool guitar with a more "classic rock" sound (so you sound great but don't sound exactly like a Steve Vai CD) you might want to look at the BRM.
Overall neither guitar is "better" it's up to the guitarist playing it to choose which he likes best.
Which bridge is best.
The Edge series of trems has been going for over 20 years and each one is a slight change to the last. The newest trem the Edge Zero is perhaps the biggest change and as far as I know isn't yet on the JEM guitars it shares some features with Ibanez's own Zr trem system.
The "Edge Pro" "Lo-Pro Edge" were redesigns of the original Edge trem and are great trems.
My favourite is the original Edge trem from all those years ago, Joe Satriani still requests it on a lot of his custom instruments from Ibanez and it's been very popular on the recent "re-issue" series.
The pickups are different models designed to Steve Vai's tastes. The Evolutions (as found in Evo) have that very distinctive "Vai" tone and many guitariss (especially those here) either love them or hate them. They're very focused and modern sounding. They're a great way to sound like Steve Vai (but necessarily play like Steve Vai
) very easily. If you listen to Sex and Religion or Alien Love Secrets you can hear these pickups distinctive tones.
The Breeds are more "regular" sounding pickups, designed to sound more like a traditional, fatter, "Les Paul" sound.
So I'd say you need to decide what's most important to you, and if looking and sounding like Steve Vai is high up there on the list, the white JEM is the way to go. If you have other goals, you might need to think a bit more about which to buy
This is a really fun decision to have to make though