I'm not really big on multiple playthroughs, so I just do Paragon. I'm good with just watching some renegade youtube vids.
Paragon is more interesting to me, because I feel it is easier to act Renegade than Paragon in real life given Shepard's situations.
Renegade can be funny and bad***, but it also comes off childish, impatient, and douchey. I'd just hate my own character lol.
I'm someone who's not proud of having somewhat of a short temper, so I aspire to the Paragon's skill with patience and diplomacy. Also, when you're a trained killer, I like to believe showing mercy at certain moments is for the humble and brave, whereas killing is just too easy and short-sighted (think LOTR, lol).
Ideally I'd be a paragade cause flexibility is good. But unfortunately the game is alot less rewarding for playing mix, which is kind of annoying.