B2, GroBtraktor or E25?

Lert: I have all three.   + E25 is great fun and slightly OP. + B2 is blatantly OP. + Gr.Tr. is - ... uh ... It ... trains german medium crews, I guess? I mean, if you don't have a Pz IV S ... which is cheaper to get ...   - E25 is - ... uh ... Requires skill to bring out its full potential, which can be seen as a negative if you don't have said skill, I guess - B2 can be seen by many as a seal clubber tank and is very difficult to platoon with because of unique MM - Gr.Tr is big, soft, long aim time, takes full damage from derps as well as autocannons