i agree with most of colin's assessments there
i'd like to add....
homer will go down as one cartoon's greatest characters but the past few seasons the writers for simpsons have given him so many personalities, giving him excuses just to do about anything. at least with peter, you know he just is a self serving idiot.
meg has to be one of the most annoying characters around. she really brings nothing to the table. lisa has more then her fair share of whining but at least her personality isn't as shallow meg's
i would compare instead:
moe and quagmire as both are dirty bastards, giving the edge to the Q train since he scores with the women one way or the other
ned and joe. both are the neighbors next door and the main characters from each show have a rivalry with them, homer being the bigger antagonist then peter. i would say they're equal
friends of homer- lenny, carl, barney vs. friends of peter- joe, cleveland: it's hard to compare individually the rest of homer's friends to peter's since they don't resemble one another at all other then that they're all drinking buddies. barney, carl and lenny are almost as irresponsible and hold crap jobs like homer while joe & cleveland are married and lead respectable lives.
even though the simpsons have been around so long, lenny or carl haven't been really developed. they still can't stand alone on the screen for more then 1 minute unless homer's involved. that's pretty sad. but i still enjoy the one-liners and their friendship. i give the edge to peter's buddies
both the peuteshcmidts and marge's sister want their in laws gone but mr. peuterschmidt actually attempted to have his murdered. and he banged a dog!