Colossus can give raditz a good fight if he could tag him. Raditz has the speed advantage and range capability. Raditz can take a hit and once he realizes colossus is a threat he will play the range game. When it gets toH2H I don't see colossus being able to hit him. He was dodging both piccolo and goku as they tried to hit him at high speeds beyond colossus capability.
Lol...Raditz stomps. The guy tanked a blast from Piccolo (moon busting Piccolo) and didn't flinch. The same Piccolo that destroyed a moon with ease. He is stronger than Goku that was a clear 100 tonner, even as a kid. So he is mkre durable and stronger than Colossus. Raditz wins this is the first millisecond.