In the earlier seasons of the show, definitely homer. He was an actually flawed, yet likeable character. He was a moron, but would always try and do whatever he could for his family, and make up for it when he was a **** (...if we ignore the strangling)
...Hal is pretty funny tho. But seems I can't add a vote to him aswell :/
I mean if it was purely best to watch, it would absolutely be walter white... but, pretty sure 90% of that show is showing why he's a terrible person sooo...