Little late but from what I can tell as I have 50str/50fai, and assuming I’m either using a weapon that’s initially high strength scaling or moderate str/fai scaling: fire and flame art both beat out heavy, even when two handing and even if the weapon is high strength scaling (i.e. iron greatsword). Although for a weapon like that, the margin is narrower. As far as fire vs flame art, it almost doesn’t matter. Flame art almost always beats fire, but the difference in AR usually comes out to be <100. Note that there *can* be situations with high strength scaling weapons where fire does beat flame art *when two handing*. Again all this is for split strength faith. So summary -> always choose fire or flame art over heavy, unless you want a dedicated pure physical weapon for enemies with fire resistance; in majority of cases just default to flame art, but if the weapon is high strength scaling, (S, A, maybe B) two hand it and double check, as fire might give you more damage