World tank

I prefer german TD.

There's no "best line".There are only TDs that are good for their features and situations.

The best is get all td's and then choose the one you like best.  Each tier 10 TD play differently all the way to the top.  Another point is do you like turrets or non-turreted. These tanks play way differently.  I enjoy the German turreted - but long drag to get to them.  Same with American td,s  I play both t10 - they are a pain to all and a pain to you if you dont play each style correctly