I want to know specifically which unit you choose!
Used for pvp and zhg!
for example: lightweight unit: rifleman / operator / commando / viper... choose one?
Not sure about Light, but I prefer using low resource per offense/ defense troops for PvP. Specifically, I prefer Recon for offense and sappers for defense. Riflemen have a better offense per resource ratio, but they're just too slow for my tastes. Also, if you do it this way (using low cost troops) you inflict damage on your enemies while taking a much smaller resource hit. Not to mention that lots of targets tend to be weak against massed infantry.
I should note that when I find medium sized targets I feel I can wipe using the occupation method, I send more than just my infantry.
For ZHG, my preference is infantry and heavy infantry. I also throw in my thunderheads for those that are weak against offensive aviation. I do this to slowly convert them to armor, as this will allow my overall offense to increase even though I am sacrificing resources.
I should note that I only keeps offensive armor, as I have chosen to slowly make myself into a hammer. The only defense troops I don't sacrifice are aviation. Those I reserve for my combine's MCs.