Rzhev Winter closely followed by oka river. Both have nice ice placements, good movements and
accesible cutoffs.
Steppes is "ok", just very bland
City17 doesnt work in 3v3 for the fact that the outcome depends where everyone spawns, with the two split bases apart you can end up in 2 2v1 battles, where one team ultimately snowballs the other. It also favours germans with all the mgs in the houses. I dont knwo if the new patch has changed that, we have it vetoed still

Rzehv summer is prypiat with more chokepoints.
city 17 winter, only played this once. its more open which is good. I think ti still suffers from the seperate bases.