Whilst a lot of people who apply for medicine also apply for biomedical science, it is still a difficult and 'impressive' degree.
If you are interested in research alone, study biomedical science. You will acquire the lab and statistical skills that you need, and learn far more relevant things, as well as making contacts and having careers fairs which introduce you to the varying research jobs that you can apply for.
If you decide to study medicine, you will definitely have to work with patients throughout your degree. It is a very demanding and stressful course, so if you don't enjoy it, it is incredibly difficult to do well. Whilst you can do research during your course and afterwards, there is no point in doing it if you aren't interested in working with patients and becoming a doctor.