I got to visit for my first time July 9 & 10. Had a blast! Longest wait of the day was maybe 15 minutes for Verbolten. We spend the majority of our time on Verbolten and Apollo's Chariot; two incredibly fun rides!
As far as BGW vs BGT, BGW is definitely better as an overall park. Regarding rides though, I prefer the coaster collection at BGT. BGT just needs a ride like Apollo's Chariot and we would be set.
As far as rides that can be compared:
Sheikra vs Griffon: I prefer Sheikra for the surroundings and the tunnel. Griffon has a strange jerk in the track just after the splash and the small hill into the brakes was a little painful.
Montu vs Alpengeist: Montu wins it for me mainly because of the Batwing and I prefer the order of elements.
The others can't really be compared IMO.