I've always been an humanoid-only artist, maybe I was part of the wrong fandoms? :') I also think that since I was never really into real life animals in the first place, I personally never felt any appeal in animal-like characters.
Like many people before me said, I feel like I can do more stuff with (and relate more to) humans and humanoids, especially since my stories tend to borrow a lot of stuff from the real world. Animal-like features would feel out of place to me, and I generally prefer practical designs over purely aesthetic ones; I feel the need to explain every design choice with an in-universe reasoning haha... I'm not saying that it's impossible to write a story with anthos or ferals, just that it's not really my thing :')
That said, I'm way more comfortable with drawing humans than animals, but that's probably because I never really tried in the first place (some OCs' pets and art trades/comms aside). I don't think one is easier to draw than another, it just depends on the artist's experience and stuff~