Like so many others, I'd say it varies, but generally I enjoy both. After all, if you're going to experience a new body, why not a new sex as well? Doubly so if the gender is something mixed beyond the standard trinity of male/female/feminine-herm. Shemales, Cuntbois, Bustymen, hirsute or masculinized females, there's so much more to the gender spectrum that can be explored alongside a shift from species to species (which I don't wish to discount, don't get me wrong).
I prefer the weird shit, like boob-pets and sextoys and blueberries and card-trappings, but I like female form a lot more for certain things, so it depends on the starting gender.
or is it tgtf?