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Honestly this is so much harder to say as unlike for 1vs1 there isn't as much of a consensus of a "definitve" map pool and there is a LOT more variation with match ups etc. And then there may be different roles in a 2vs2. That said Entente is easily up there, both for Highway and in general. Very versatile and strong options for pretty much everything. Lots of heavy tanks while not sacrificing cheap stuff/ potential town fighting infantry.
Don't mean to give German lessons to a native speaker, but "Sitzkrieg" was more a slang/propagandistic term mainly used in the English speaking media, whereas the technical term for that sort of positional warfare was (and is?) "Stellungskrieg," the opposite of "Bewegungskrieg." Just the more you know.