My problem with AMX M4 arguments are.
It has a bigger cupola. Arguably weaker turret (thicker but flat)
It's HULL is thicker but never autobounce, only high armor bounce.
It has the same plague the ferdi and Tiger p have, the dreaded side plates. When even slight off angle, still autobounce sides, the AMX M4 will make his hull "shoulders" about 200 thick of FLAT armor. Which is to say, he can only point his armor at you, if he angles he makes himself weaker.
252 gets stronger at off angle...
This is ignoring the fact that the AMX M4 has 40 less side armor and is MUCH much taller. Or that it has 140 less alpha per shot.