TC for Nikon 70-800mm f2.8

I'm thinking of buying a TC for my nikon 70-200mm f2.8. What do you all recommend?

Nikon TC14E or Kenko Pro 300 1.4

James

I agree with James. I think that the performance of the 1,7XTC and 2XTC on this lens is not very nice

Thanks for your prompt responses.

I do use it with the 1.7X and don't have that much of a problem It is sharp but AF slows Planing will get you birds in flight without problems.