The penetration of both guns are the same, with the only real difference being one point in accuracy, so the things are basically identical.
I vaguely recall a massive data check on the varicose Sherman variants being done a decade or so back in the MSDOS days. Up until then, I had just thought that a 75mm Sherman was just a 75mm Sherman..
Since nobody has brought this point up since then, if it is a valid point, then I suppose that everyone is happy with the existing Sherman models?
(Me, I just find the one with the best frontal armour as a general rule and buy that).