Bisping trained in traditional jujitsu not BJJ when he was younger I think. He only started training BJJ for MMA.
I'd still probably give the edge in Jitz to him even though I've seen Leben work a decent rubber guard before. Slight edge in wrestling goes to Leben although Bisping did ok against Rashad so it's only slight. Standing I think everones calling it the same way. Technical edge and kicks go to Bisping but Lebens got more power and a better chin.
I'm liking this matchup TBH and I don't know who wins it.
From a personal viewpoint I'm on kinda on the fence aswell, I like both fighters but I'm not a ridiculously big fan of either. Just gutted I'm not gonna be there.