Uh given what stats you've named, it's like saying grens are twice as good as rifles because their weapons deal 16 per hit instead of 8.
Point is, there are are a lot more relevant stats and components at work here.
I agree but if you look at those they are so close to each other that it's not really all that important - I just wanted to show the really big stuff like their ability to penetrate each other and AOE vs. infantry. If someone wants to argue that Cromwell's slightly better speed or turret rotation makes it as as over the top good as OP suggests then by all means... The point is that Cromwell has had so many nerfs since Brits launch that it's balanced now.