They are fairly different breeds, so can't really compare them. Rhinelanders are around 8 pounds full grown, Polish are about 3 pounds. The size alone can steer people one way or the other. Rhinelanders are active and can be goofy, but do have good personalities. Polish tend to be more laid back and easy going. Both are good breeds and do make good pets. If you were wanting to show, Rhinelanders so have specific markings, so it can be hard to find ones that are good for show.
If it hard to recommend a breed without knowing what you want in a rabbit. I do realize it can be hard to narrow it down with all the choices out there, but even think about size, energy level, and general personality. Looks are not everything, but a breed or individual that you like the look of can go far, you do have to look at the rabbit every day and want one you like.
I would suggest to look at a few breeds to help you decide. If there is a rabbit show near you, go to it and talk with people. If you see a rabbit you like, ask about it. Seeing them in person does help. You might not see a lot of the personality at a show, but that can depend on the rabbit, some just travel better and are more themselves at a show. A show is typically local people, so does give you an idea on what breeds are easier to find in your area. Even if you are not wanting to show or breed, it is still a good place to look at breeds and meet breeders. Some breeders so sell pets that are not suitable for showing (wrong colour or markings, white toe nail, etc).
