Flame Tank - Slightly slow, superb armor, extremely strong against vehicles and buildings, bad range.

Light Tank - Excellent speed, good armor, fairly powerful, great against almost everything.

APC - Pretty obvious here.

Nod Buggy - Great infantry stomper, decent firepower, superb speed, crappy armor.

Stealth Tank - Good speed, good firepower, awful armor, poor range.

Mobile Artilery - Amazing damage, awful armor, slow.

If anyone wants to add to that, feel free.