Most likely, Hilary Clinton probably has a stronger fan following than Bill Clinton. This is because she has been more active regarding politics and being in the public than her husband. She ran for the presidential election a few years ago. She is also keeping up her public image more than her husband who seems to have retired and only does some community service and nonprofit events as well as give speeches.
Therefore, Hilary Clinton still is on the scene in regard to her career. She will probably have a stronger fan base until she quits politics for sure. Up until now, she may still run for president again, but it is probably unlikely. Her fans are still pushing her to become president.