I'll keep it to providers I've seen that are currently active.
In terms of sheer sexiness/hotness, Lemon @ XDS has the most fuck doll look, and has the best, most vigorous PS out of my list imo. Big bolt ons and a great mirror set up have her as the "steamiest" provider at nuru. Only downside for me I found is after nuru she didn't really wipe the gel properly, so it felt little too sticky when we transitioned to fs
Miju @ K604 is super sweet, with a softer enhanced rack than Lemon. Starts with a great chair routine, and also pulls out some great tricks (eg footjob). Great with rubbing her pussy all over your body and gets in interesting positions. Easily the deepest and best rimming of the providers here. On the better end of nuru providers and one I try to repeat with more often largely because of her attitude.
Flower @DN I can only speak to her nuru on a previous tour, which I found kind of standard and didn't stand out. However, with her new 1hr set up of bath and shower tease play, after a regular session of this I find myself wanting to retry her nuru after an amazing regular session recently. I think all of her special features paired with her nuru would be a sensory overload experience. Her tits are the perfect size for nuru imo.
Honourable mention to Simone @DN who, while I havent had a regular nuru session with her, used plenty of nuru gel for a tease during a regular session, which included an amazing chair PS and Russian, and great thigh job when on the bed. I need to try a regular nuru session with her one day. Her tits seem like they would be a great size and feel for nuru as well. However, of all the ladies here she is visually the oldest (but still looks good and has a great body).
Hope this helps!