If I happen to find myself in a pub that is serving Hobgoblin / Copper Dragon / Jennings or something similar then I'll have that. Isn't usually the case though so I'll plump for a Lager, which isn't the end of the world if it comes in a clean glass and the pipes are clean, I find that a pint in a spoons' or similar chain usually tastes ****ing horrible compared to a more "local" pub.
Has to be lager from the super market too as they charge too bloody much for bottles of the good stuff.