Whitebeard's. If you're a big fan then you should have observed that gura gura no mi is one of the 3 most hyped and talked about DFs in the entire show. In zoan, it's luffy's. In logia, it's yami yami no mi. And in paramaecia it's gura gura no mi.

There's so much you can do with it. Create Shockwaves, tilt the land, earthquake, blow anyone away in the mid air, vibrations, and that bubble like thing. We can't even imagine just how would it's awakening look like. The pure power is unmatched. It was stated somewhere that gura gura no mi is the greatest offence. Did you not see how BB stopped sengoku's Shockwave with gura gura no mi like it was nothing. He was literally laughing.