Sega obviously, it had blast processing!
Seriously though the Angry Nintendo Nerd's two part episode on this is a must:
First the console wars of the early days were nothing like today. They were childish face to face school yard arguments we kids used to have. Just look at those old Sega commercials and stuff like the Nintendo Power Glove, totally targeted towards 10 year olds. I suppose those arguments still happen today between Sony/Microsoft strong as ever, but now it spills out onto the internet for all the world to see where thanks to anonymity you have no idea how old the people arguing are.
For the poll I voted Sega, though really in my family through the 8 and 16 bit consoles we went through both sides, trading a console in at the used game store every once in a while to get the other one. I tend to lean towards Sega because most of my friends were strictly Nintendo kids so I always felt I had to stick up for it a little, but we never really went full on console war.
The only time I ever felt really involved was with my Sega Saturn. In my opinion, the first 2 years of the console was great. It came out first, and had a strong line up of games. But from my view seemed wary of Sega from the Sega CD and 32X, they all jumped on board with the Sony Playstation when it came out. Having played both I always thought the PS games were shit at first. If you play some of the early ones (Ridge Racer, Tekken) they really haven't aged well, where what Sega was offering were games ported from their successful arcade lineup and were much more polished. But Sega never got support, eventually the PS started getting games like Need for Speed, Tekken 3, and FFVII, and from there it was lights out.