
If you are finding it tough getting through campaigns, then you may need to pause the single unit strategy, and create a balanced team in order to get as far as you can in campaigns, see our campaigns guide for our recommendations. It also means playing through a lot of campaigns in order to get the upgrade materials you need to continually upgrade your chosen unit, and to give them the best parts and lots of modifications. This means completing a lot of research to unlock the ability to even get a unit to 120.

The best strategy therefore is to focus on getting a single unit to level 120.

When I first started to play Warpath I had a collection of units, all about the same level,70, 80 etc. One important element of the game is field battles, sooner or later you'll need to defend your base on go on the attack with your Alliance, or on your own! And to do this well you'll need some kind of field battle strategy, including an idea of what sort of units you'll need.
