Argments about what beer tastes best are bound to be pointless.
(a) Personal taste varies (for example, I think Guinness is great. But Beamish is even better)
(b) It depends on time of day, the weather (try a litre of Chimay Blue as a refresher on a hot summer's day, and see how well that works....
), and what food (if any) it is to accompany.