On the select/buy screen, each tank has a rating from

Hell - Hard - Normal - Easy - OP

you will probably win the game with an Easy or OP vehicle each time.

There's no right or wrong way, and once you get a grasp for the game, beating it with Hell tanks is entirely possible,

The T-28 is probably one of the best tanks you can use right off the bat, It's fast, can mount 3 turrets, and it's -fast-

Flank around, shoot butts and sides and unlock things that seem fun. Once you get better at the game, then you can challenge yourself with harder tanks.

oh until you mentioned i didn't see the rating of the tanks i was more occupied looking at the other stats like penetration, damage,...

thanks for your help

The Sonderkraftfahrzeug 2 is argueably one of the most fun tanks in the game.
And it doesn't need many lemons.
It is also fast and small enough to outrun or hide from bosses while capping if you have trouble killing them.

The Cruiser I if you want a multi turret tank. Replace the main gun with a 4 penetration HVAP gun at the start if possible. I mangaged to get 100% resistance , 61/38 speed , 1x 21 cm Nebelwerfer turret ( the best turret in the game insane range, 30 AOE damage with HE upgrade and 5 round before you have to reload) , 1x Möbelwagen turret , 1x Kugelblitz turret during my last run and several usefull crew upgrades.