It really depends on the features you care about and what you want to spend on it. The Lovense lush 3 is the usual recommendation, but I would look at the different shapes to see what looks most appealing. A lot of them are going to get the job done for a lot less than the lush as long as they have decent reviews, are a somewhat reputable company, and aren't a cheap knockoff.
Battery life, quietness and letting people cobtrol it are the main things im looking for as long as its not uncomfortsvle. I'd love one i could use without it heing noticeable but idk if any are quiet enough.