Which ASW Aeroplanes are you most fearful of?

[scott_c2911]

I got pounced on by a Liberator approaching the Caribbean and I was surprised by the tenacity of it. It had no fewer than 4 runs at us despite having evaded him in time. I was wondering which aeroplane type(s) you are most likely to dread the sight of? Mine is the liberator at the moment. I shoot swordfish and kingfishers down for fun but anything else I get under sharpish.