In your opinion, what's the best tech tree for heavy tanks?

For me the Russians are the best if you are just looking to play big tanks due to them having them relatively early in thier TT (rank 2) without getting like the T35 Premium Heavy at rank I (Even though its so fun) and a good variety of designs. Americans get fun too, but if you already have worked a portion of the German tree as you say then you cant really go wrong there either. Big Cats are certainly really fun to play.