I face backwards if possible. When I was a kid someone told me that you're safer facing backwards in the event of an accident, which sounds plausible (though I don't know whether the stats back it up). Presumably a forward-facing table seat is not going to be the best place to sit in an accident.
Other than that, as a possessor of long legs I prefer airline seats when commuting and table seats for longer journeys. My trains (Waterloo - Dorking; I think they're 455s) have carriages which differ in their seating layouts, and I can usually predict where the good carriage will be. The good carriage is the one where the middle block contains mostly airline seating, and the row immediately in front of the Priority seating has the same amount of legroom as the Priority rows but with less risk of getting asked to vacate the seat in favour of someone who appears to be more disabled than I am.
(In fact those seats, or "my seats" as I like to think of them, are actually superior to the Priority seats because the latter tend to have various obstructions under the seat in front, which reduces legroom)