Both were pretty talented, I don't really think one was really better than the other, they each had an element of comedy they were great at.
It just happens sometimes that comedy duos that split up end up having having careers that veer different directions in terms of successfulness. It's far from uncommon, even when just talking about Nickelodeon stars (Just look at Josh and Drake; One is doing great, while the other is hitting up underage children now).