After many years alone with the Raiders, my explorers finally stumbled into somebody else's jumpgate chain. The happy friendly Hydralisk of the Windorah Empire seem to be running a chain of outposts one way down the path. The other, though, has a completely different set of aliens who don't talk and seem to be hanging around a planet with too little signature to be a serious colony, and attack my scouts that come too close with heavy but seeminly not too technically superior ASM.
Both directions have raider wrecks, but the second also has a multitude of large unidentified wrecks. Perhaps they've been killing the Windorah? I can't tell yet.
So, I just dropped 200,000 tons of troops onto about 60,000 tons of ground forces, my forces being a 50/50 mix of PA infantry and medium tanks. They got shredded to pieces. The enemy infantry's armor is 15, whereas my infantry guns are only penetration 6. The enemy has like 1,200 machine gun infantry. Not sure if I should make heavy armor infantry (so my armor would be 16 instead of 12 vs enemy AP of 10) or abandon infantry and go for entirely heavy tanks, since the enemy only has around 100 tanks on the planet. I only killed about 100 infantry and 10 tanks in exchange for loosing 10,000 infantry and 672 tanks
Wouldn't those 10,000 infantry only be 30,000 tons? It sounds like they were using PWL...
If the terrain is viable for armor, a bunch of medium or heavy vehicles with HCAP and probably HAV seems appropriate.
Remember that planetary defenders will be entrenched, likely to the maximum possible for their type, while your attack force won't.