My favorite beer is the one in my glass
I'd have to pick a favorite for each style - except lagers and pilsners, those are my least favorite styles.
Stout: Beamish
Porter: Probably Sam Smiths Taddy Porter
Old: Brakspears.
Bitter: Wadworths 6X or Fullers ESB
Ale: Old Speckled Hen
Also, I brew my own