MBBS and BHMS are both bachelor medical courses. Both have their own hard parts, and it can be tricky to say which one is more hard.
MBBS is normal medicine course about allopathic medicine. The study is tough and need lots of knowledge and practice. Students also work in hospital to get real experience.
BHMS revolve around homeopathy which is a kind of alternative medicine. Students learn to treat people by looking at symptoms and whole body.