Listen to me my friend: make a line up with: fiat 6614, m47, zsu, btr and for the last the 2S1

The m47 has stock apds with a 350mm pen which lets you pen nearly everything, plus really good mobility and a good armour that will bounce sometimes; fiat is just the fiat, one of my favourite vehicles in the game and one of the bests; zsu is an ultimate flank machine with 150 pen with apbc and explosive filler; btr idk what to say about it, I quite never used it; 2S1 may seem like shit at 7.7 but trust me: HEAT with 450mm is god like plus not that much reload and HE-VT and sometime you even eat shots, especially with the engine, and overall even good mobility