Whichever one you prefer. Pump vs magfed vs semi is all about personal preference, there isn't one that is more fun overall. Someone who loves magfed might hate pump, someone who loves pump might hate semi, someone might enjoy semi and magfed, but hate pump. You just need to try out a magfed and a pump and see which one you prefer. All we can do is tell you what we like, but nobody will be able to tell you what you like, so you need to go try them and figure out which one works better for you. Personally, I enjoy pump, semi and mag fed.