For me, HE is your best friend. Say what you want but there is more infantry on a map than tanks. Ofcourse using different ammo type depends on situation you're currently in so awarness is most powerfull asset for a tank. If you enter empty space or suspect enemy tanks use AP (duh), in close quarters HE just shreds enemy infatry. Even if you see enemy infantry getting to your butt a single shot to the nearby ground takes care of them. I also suggest using HE instead of MG if you spot infantry in a distance. 1. You can take them down really fast with just one shot and 2. You won't draw attention of enemy tanks. Firing MG at planes or distant infantry on a frontline is the best way to give away your position. Use MG on close to mid ranges only or if you are certain of your safety.
this^
HE is the sherman tanker its best friend, you would be amazed how much kills you can rank up against infantery
Sure, you are shit against tanks, but if you get killed by one, but you ripped trough a flag with 15 Kills on your marker, you did a fine job
The best way is to just lob shells from far, safe from all those nooby panzerfausts/shrecks (
i dint start the fire!)