Sheik is a beast. that's why I feel so comfortable waiting people out. sheik's second jump is amazing. Her up B is way more vertical than horizontal as well...
I don't know about second best... I used to think that but now.... not so much. fair is probablly one of the best gimping moves in the game as far as trajectory, but because it isn't disjointed and because of sheik's horizontal air speed it is hard to really force people into situations where they have to be hit by it while recovering.
needles can be a good way to force people where you want them, and they are one of the better projectiles at gimping recoveries. full aerial needles combo into fair.
OH SNAP reminded me.
I was playing renki check out this combo. single aerial needle->single aerial needle->fair
man... that was neat. (renki was ****** me though a lot of the day. I think he is gonna be the best sheik soon, his only limits right now are experince and little percent things that efect sheiks combos)
you can also use vanish like pikachu uses thunder. put the explosion in the only place they can go at no risk to yourself.