Corinnguard
Hero
The problem with Favored Enemy in 5e is that once you make your favored enemy selections, they are 'locked-in'. You can't back out of them once you find out that none of them exist in your current adventure. Ditto for Favored Terrain. This is why I prefer the Favored Foe and Deft Explorer features from Tasha's Cauldron of the Everything for my current Ranger character.The thing I lament the most is the lack of the thematic elements such as favored terrain and foes. They were barely ribbons, but if you gave 2 choices at 1st level and the option to retrain them after a long rest, it made a some flavorful thematic options. IMO, way more than "hunter's mark: the class".
With Favored Foe, everybody is a target.

Level Up has a version of Favored Enemy (called Studied Adversary) that works pretty much like the 5e version except you can swap out your studied adversary per long rest. Where did WoTC get the idea that Rangers specialized in killing one type of Monster?