who has the best heavy's tank? and the light's tank?

Tanitha: Heavy. (I only compare the top tanks IE T10's.)
USA has the bigger gun. The IS7 is nice, The maus is a bit too slow so gets hammered by arty.
All in all, IS7 (Russian)
Lights.
The german has the leopard which is the best light scout tank.
And the hotchkiss premium is called the micro maus for a reason.. Its a heavily armored T2 light, so strong for its level.
Just IMO's...