Rampage's one dimensional striking is way beyond Hamill's striking. I also do not see Hamill being able to consistently take Rampage down and hold him there. If that is the case, Rampage takes it.
Hamill's only real decent shot is to be able to control the fight but I doubt he is strong enough to control Rampage in the clinch and I think Rampage can stay on his feet here.
"Don't be shocked that people die. Be surprised you're still alive."