Tough call. Your best bet is always to listen to them and pick what you like best. Listening in your own room is ideal but not always very practical.
The KEFs have the best dispersion (making them more friendly to a variety of rooms), but they have some midrange cone breakup problems not fully addressed by the crossover that can impart a little harshness on some material.
The Paradigms probably have the best bass and can go pretty loud.
The PSBs are probably the smoothest, maybe the most "refined."
I don't think you can really go wrong with any of them, so it's really a personal call you'll have to make, based on sound, looks, price, whatever.
For every new thing I learn, I forget two things I used to know.