I'd take the Puma with the 50mm. I and 2 others have destroyed a tiger tank in M8s. Its possible just matters your distance from target, and where you shoot it. Like I have said in the past, the more heavier armourd, more powerful tanks we get the less chance of getting something like the Puma, or Sherman, because then people will be complaining about it not being able to compet with the more heavily armourd/larger caliber gun tanks. I think HTC needs to spend more time on the Lighter/Medium armoured tanks then these heavily armourd tanks.
Think of it like planes. No one wants early war fighters because theres so many late war fighters, and people want planes that can compet with the late war fighters. More light/medium tanks, the better chance of having fun, and then we can get those awsome heavy tanks.