There are tons of different opinion about this subject but........

There is no reason for you to change. Why do you want to switch, you are using a good head right now and you have had success with it. Don't switch! Muzzy's are tough bone breaking heads. I shot exspandables for years and had to many things go wrong so Im now using a stinger and love it and will never go back to a expandable.

If you are having no problems with what you have don't switch.