In general?
Marketing research speaking.... For a while comedic adds worked better, however then EVERYBODY started doing them, as such... serious adds have gotten more effective as everybody is just used to joke adds by now.
In general the answer is, the adds that make your product stand out vs other adds... so long as said commercial doesn't make your product undesirable. (like the first PS3 creepy baby ads did.)
Of course... quality of ads matter.








