Blockland needs blocky stuff, so I'd say T+T too (And Frog's in case you want some futuristic theme). T+T looks awsome, is prefectly balanced, has all kinds of weapons (a weapon for everyone) and the most importantly, it's very fun to use.
When talking about weapon packs, nothing can beat the all-theme-fitting T+T.
I hope that Bushido would make more vehicles too to go with the weapons, like a nice dogfighter plane with mounted raycast weapons (So everyone has a chance to hit) :L