Both are good options.
H180: +/- 80 degrees rotation, more expenive, limited by weight of dish.
Actuator: Less rotation ( I don't have the figure), cheaper, and weight of dish is not critical (since you can get a Heavy duty actuator instead of Std duty)
BTW, you can use the Polar Mount style 180cm dish with an H180 motor. But you will have to separately get/make the two L or Square brackets that attach the H180 to the dish.