Crib Goch. I don’t remember Sharp Edge as being all that. There’s a flat, but very exposed polished rock section in the middle of Sharp Edge that is an easy few normal steps on a dry windless day, but would be terrifying in a howling wind when covered in verglas, otherwise I can’t remember much about the route itself.
Crib Goch is longer and has a lot more going on. However getting it to yourself would be the tricky bit. (we did it late evening and bivvyed up at the cafe).
You wouldn’t want to fall off either, mind…