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Can you explain the difference between this skill feat and battle medicine? Does it allow you to go further up the feat tree to continual recovery or legendary medic because you can substitute your nature skill instead of medicine? If not, why take it over medicine? Would an animal companion ranger be better off with taking medicine instead?
You would still need medicine proficiency to take skill feats with medicine proficiency prerequisites.
Battle medicine is about gaining the ability to provide some hp healing in 1 action, instead of 10 minutes.
The main appeal of Natural Medicine would be if you were planning to increase your skill level in Nature. Skill increases are limited, and you have to make choices about what skills to raise. If nature is one of your priorities and medicine is not, then this feat will make you significantly better at treating wounds, than if your just relied on medicine at a low level of proficiency.
A character you invests heavily in medicine, both proficiency and skill feats, will be better at medicine than someone with only natural healing, but will have invested more to get there. Whether that is better for your ranger depends on what else you would do with those skill increases and feats, instead of more medicine, and on what the rest of your party can do.
It's mostly for characters who don't invest in Medicine at all but still want to Treat Wounds.
Alternatively, if you go to Expert in Medicine to unlock the most desirable skill feats for it, you could then leave it there and get Nature to legendary. It's also a good use for the skilled human heritage to get medicine to expert so you can still get three skills to legendary.