There's a lot of things to consider here when you want "best to worst". There's cost vs efficiency, there's micro requirement, doctrinal factors etc. Since there wasn't a specific category given here aside from 1v1 I'll just assume "best overall tank". List categories are from best to worst overall.
Stock medium tanks: Can engage both infantry and armor and instill threat. Available without commanders.
M4A3 Sherman
OKW P4
T34/76
Ostheer P4
Cromwell
Advanced/Doctrinal mediums: Can engage both infantry and armor and instill threat.
T34/85
M4A3E8 (Easy 8)
Panther (Both variants)
76 Sherman (Both variants)
Comet
Heavy tanks: Engages both armor and infantry and able to bounce/soak damage.
Pershing
Tiger 1 (Ace included)
KV-1
Churchill
IS2
Tiger 2
KV-8
Crocodile
KV-2
Tank destroyers: Engages armor
ONLY with reliablity. These are all good in their own ways and completely viable currently, so take this list with a grain of salt.
Jackson
Su85
Stug G
JP4
Firefly
Heavy tank destroyers: When engaging armor.
Jagdtiger
Elephant (although an arguement can be made for this to be 1st as it carries target weak point)
ISU-152
Heavy tank destroyers: When engaging infantry.
ISU-152
Jagdtiger
Elephant <-
Light tanks: Engages mainly infantry and occasionally other lights.
T70
Luchs
Stuart
Valentine
Not making a list for armored cars, AI mediums or include the brummbar anywhere. Armored cars are all decent, AI tanks are mostly decent and the brummbar is great/borderline requires nerf.