Thanks a lot for your help. Thought I knew most of the tanks, I'm going to enjoy looking this up.
Which one is better do you think? Seems like the non doctrinal seems better as it goes the same speed after upgraded the engine and doesn't have spearhead as well as blitz at vet 3.
They have completely different roles, ranges and gun profiles. There is a whole world for you to explore. For some initial info on units, which would perform better in certain situations and why, you can visit https://www.coh2db.com/stats/ There is a bit of outdated info there, but vast majority of stats is up to date. You can also search for "tightrope gaming" on YouTube and see his Coh2 Starter Series, he has very useful and informative videos, though some info may be outdated there as well (ghost sandbags, etc.)