Definitly Vimes.
I used to think I would be more of a Carrot girl,but being married to one (a Carrot) for ten years changed my viewpoint considerably....
All this moral integrity gets at you after a while and I think the way Vimes is actually aware of his failings makes him so much more likeable,more real,as it were.
He knows he´s "not the sharpest knife in the drawer"but uses his abilities to get to grips with the situation before him anyway.
He doesn´t mind playing dirty and he´s aware of his demons all the time but manages to stay on top.
He´s been a reallife inspiration for me at times,I got into trouble once and actually found myself thinking:What would Vimes do?
I totally admire the way Pterry has made this character grow from the gutter to the ducal crown and he still stays the same person inside,the money and power doesn´t corrupt him.
He also loves Sybil for being Sybil,not for being Lady Ramkin,which I think appealing.
I don´t mind Carrot,he has his moments and the story definitly needs him.I also think that he doesn´t develop much in the books as Vimes does, he obviously did all his development in the first book,all in one go,and that was it.
I like him with Angua,although sometimes I think she could do with a different sort of guy to make her come out more.The way she´s aware of him being the master and she the dog gives me the creeps,good he doesnt really use it.
Plus his limited outlook on things makes me impatient at times,as with his reaction to Cheery/Cheri,I was disappointed then because I hadnt expected him to be so prejudiced.
But then I guess someone always has to be the guy with all the muscles...
And:there are plenty of Carrots in Roundworld,but,alas,not so many Vimes´.....