Costa. Starbucks' coffee is vile. Okay, I haven't had it that often, but the one time I did I was basically given a pint of warm, slightly bitter, milk. In fact, I'm not even sure if it tasted milky. Either way, it didn't taste of coffee really. Costa isn't amazing, but I generally go there because the staff are good, and it's more accessible than Nero or the extremely good independent shops round here.