My wife and daughter are both using Ursa Major and Flashpoint right now. They’re running 2ml of Ursa Major and 1ml of Flashpoint. I don’t know that there is necessarily a best one, but the combo seems to be helping them tighten up a bit. However, I’d say if someone is already lean, Flashpoint will be a bit better at tightening skin, whereas Ursa Major acts like a fat burner. So, Ursa might be better for someone looking to dump some chubs or recomp.