I like both Panzer Commander and Pazer Elite.
PC is a good tank sim. It is easy to play. It models a whole bunch of tanks, and you can even edit the files so you can drive ALL the units in the game (halftracks, assault guns, ect).
It's three drawbacks that keep it from being great:
1. Laughable ballistics model. Point and shoot.
2. Infantry...arne't. It has "pill boxes" that all look the same, whether it is a machinegun crew, anti-tank rifle squad, rocket/bazooka teams, ect.
3. No in game test drive/quick battle game. You have to create your own missions with the mission editor to drive XXXX tank.
PE is a better tank sim all around, excepting ease of use. I haven't played it hardly at all. My system is showing its age and doesn't run it that well. Still, I have seen it's other fault is an extremely overcomplicated keyboard configuration. The default setup is so convoluted that it makes little sense to me. Shift key, alt key, control key are practically used everywhere for common keypresses. I HIGHLY suggets the first thing you do is re-do the keyboard controls with the key-mapper.