I have a question: many Megadeth fans say that the original A Tout le Monde is really better than the version featuring Scabbia :D. I asked them to provide arguments (on the same forum), but I never got an answer.

Scabbia sings really well, but there's just too little of her in the remake. I think the remake would be something truly interesting and "delicious" if, for example, they gave her all the choruses. But as it is, I don't see any fundamental difference between the two versions.

In general, in my opinion, the original is always better than a remake.

Mostly yes, for some reason it usually turns out that way. But I also have some counter-examples with Iron Maiden: some songs from the Blaze Bayley era (like The Clansman) sound better to me when performed by Dickinson. Or does that not count?)