In this case I like the visuals of the sword because it is more an optional reward for beating something you normally shouldn't and it is an on fire sword from a devil.
For the fighting style thing, personally I wouldn't homebrew that because I still feel like Larian should put Ranger resources to implementing the optional tasha's stuff, so that when one levels up they have the option to choose between OG Ranger or Tasha's Ranger features and then from there choose whatever.