I have to disagree with the Mauraders pranks being ruthless. We have no evidence of this. What they did to Snape, I believe was more the exception than the rule. Yes, there was a comment about James hexing people in the halls just because he could, but I do not believe that the hexes were mean or to the extent they were with Snape.
Whereas MWPP did all the pranks on Snape because they didn't like him. They didn't start a joke business. I feel that they were more arrogant and all. So their style would be a bit more ruthless, I feel. But not too mean, they aren't Death Eaters, after all.