My votes, in this order:
1. Prisms. Generally enough on their own, but sometimes they need to be backed up with a few IFVs to defend against air. I've noticed that the game can essentially be broken down to 'whoever has the most prism tanks wins.' It's true most of the time.
2. Battle fortresses with 1 sniper, 1 chrono and 3 GGIs. They just own stuff. It's true that the GGIs are a bit weak when inside for some really annoying reason. But they let them drop air pretty quickly, and the range is pretty damn big, they can still take out tanks quite well. The sniper is essential. Try it against Yuri. He'll hate you for it. The Chrono is very good too because it lets them take out things like Tesla Coils and Prism Towers in one shot instead of having to sit back for an hour waiting for the GGIs to do it. Whoever said it makes the other shots useless is wrong. The other shots will just fire at anything that comes close whilst the Chrono is sucking the target out of time. Check it out. It rules.
3. Gattling tanks. Sure, they lose 1-on-1 with most vehicles, but they drop infantry and aircraft so fast they're easily one of the most cost-effective units you can get. Especially since if it weren't for them, Yuri would stand little-to-no chance against rocketeers at all.
Rhinos are very good too, but they suck against infantry, air, prisms, terror drones, Brutes, Yuri,... too much stuff, considering they're not so cheap.
Anyways, that's my vote!
