AC's seat, though a newer version than that which Virgin and Air NZ use, is actually inferior as far as seat space (it's narrower) and comfort are concerned, though it does have the advantage of being able to recline right down to flat so you don't have to get up and flip it over.

NH sounds like the best option to me, with AC the #2 choice. TG are so patchy they are best avoided - I've had some embarrassingly awful experiences with them lately, though they can be extremely good.