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Churchill Mark VII which was especially designed to counter Tiger I tanks having 50% more front plate armor along with the traditional 7.5cm Ordinance ATG. Could be easily converted to Croc if that's your thing. These were the tanks that pushed Rommel out of normandy and into continental Germany.
You could even go Mark IX (which never fought any serious battles) and I would be ok.
Hell, if you wanna go very deep and unicorn-y you could try to resurrect the Sentinel which never fought in any front or the Achilles.
Seriously there are so many tanks you could add that it's insane they chose BP.
And those I mentioned only scratch the bare surface, since I am at work rn.
from a dev perspective:
the problem with all these is they a too hard to differentiate when normies are playing. The gun is too small.
it has too few differences to normal churchill which normies would be able to recognize at first glance.
They are also used to mobile crap which is based on neon colors and finger sized buttons.
so the Black prince is recognized at first glance as monster churchill.
the other alternatives like the big gun achilles can't be selled as heavy tank.