If a patient in a wheelchair is comfortable with transferring, I’d personally prefer to transfer them to the dental chair. The big thing is that the transfer can be done safely. I prefer having two people help with the transfer, myself and either a caregiver or someone else in the office trained in wheelchair transfers, to be as safe as possible. I feel that I can treat them more thoroughly if I have the best access possible, and that tends to be in the dental chair. Again, as long as the patient is okay with it and there are enough people to do it safely, I would personally prefer to transfer them.
Transfer with help of their family members or aide. I usually do not help except for adjusting chair to help transfer as I do not want to hurt myself physically. I do have a quadriplegic patient and I move my main chair and they position their chair where I need it and I do have to stand while working on this particular patient.