The difference between Beartooth and Road to the Sun?

I really appreciate all the help. Speaking for myself the "nothing on the passenger side" of mountain gives me pause! I appreciate the info about shuttle service-didn't realize there was such a service. We don't arrive in GNP until mid July. Like others had posted we too loved the Beartooth,which we traveled last year. We are looking forward to seeing Glacier! Once again-thank you very much- we have a lot more info to work with.