T-90 hands down.
Excellent power to weight ratio
So does a 1957 ZIL. But that don't make it better than a '57 Bel Air.
Main 125mm cannon comparable to western 120mm cannon.
Main 125mm cannon can fire Svir missiles at ranges up to 6km at armoured land vehicles or attack helicopters.
M551 Sheridan. MGM-51C Shillelagh. BFD.
Reduced crew. 3 man versus western tanks 4 man crew.
This is a reflection of the Russian / Former Soviet system of conscription. There are significantly fewer people proficient at highly technical tasks (typically only officers and senior NCO's, because the conscripts simply can't be arsed to learn), so having an autoloading main gun has been a priority for Russian tank designers since at least WWII. Problem is, it's also slower (at least ICO T72 / T74) than most manually operated tanks.
More reliable automatic cannon loader.
More reliable ... without numbers, this one is hard to quantify. More reliable than what? Than the T72/74's system? Probably not difficult, from what my field-types have told me. More reliable than a separate, highly trained loader? Doubtful.
Additionally, that auto loading system can't help out with maintenance. It can't be trained to be a gunner. It can't take over gunner / driver / commander duties in an emergency.
Smaller size compared to western tanks
Weight of 46 tons compared to 60+ tons for western tanks
Could be a genuine advantage, depending on the survivability factors.
Compared max speed to western tanks
Ever see an M1 with its governor taken off? Back in the 80's, one got lost on an exercise in California, so the driver decided to hop on the freeway with it to get back to the exercise area. He got pulled over for speeding.
Ground pressure ratio is lower then western tanks
This is a definite advantage.[/quote]
3rd generation explosive reactive armour
Meaningless. There will be bolt-on modules for the M1, Chally, Leopard, etc. quite soon, if they're not available already.
Shtora-1 countermeasures suites
Unless Shtora features a cloaking device, it ain't gonna protect against a gunner with optical sights and an APFSDS round in the tube.
Lower cost to produce then western tanks.
Combine all that with manning the tank with a western trained crew and you have a real killer.
You -might- have a real killer. Please explain further about the Shtora and the autoloading system, etc.