Depends on which team. United were my preferred team in my youth as my uncle supported them and I could see them on TV and I've called myself a fan ever since despite being Bristol based.
They slipped to second when I started going to see City, though. Bristol's populated with more people who support the big prem teams and, unlike me, kept doing so into adulthood. It's just the history of the area, the west country's never been a heavyweight in the british game.