There are a couple of polite answers right there.

“Best gas ram gamo for quality” is a bit like “Best breed of dogshit for the tastiest sandwich”.
One might be considered better than another by a connoisseur, but to us mere plebs they are all pretty awful! I do know the older ones are nicer

Cometa are a lot better and quite good value, I tested a sub £100 rifle that was ok a couple of weeks back too. The name escapes me for the moment though….