The Sherman was so widely exported that they ended up fighting each other

But would you rather be on the side with the M48 Pattons or the Centurions?

While both tanks were roughly analogous to one another, I'd go with the Centurion as the gun is more accurate and it had APDS

True, however, there are 220 Pattons and 15 Shermans versus 135 Centurions and 90 Shermans
So I'd go with the Pattons cause there's a clear numerical advantage