Clearly I haven't shot anything irl ever and don't know much about weapons either. Oh and relax, I'm not planning on shooting anyone.
Question comes after videogames, which can sometimes have both weapon types used interchangeably and/or behaving in a similar way.
I would personally believe guns are easier, and that the only advantage a bow would ever have is that they're not as noisy. But I hear people say aiming with a bow is easier. I guess the type of bow and gun used would also weigh on the matter?
Bows are simpler logistically. Nock an arrow, pull, aim, release ("fire"). Guns have more steps up front typically but also make the round-to-round process simpler.
Both have sights that are comparable in complexity.
Form is similarly important for both.
Skill curve is similar for both at the higher end. I think bows are a little more intuitive for beginner through novice (subjective of course).
Size can vary wildly for both.
Bows need more physicality typically, so they're a little harder in that way.
Feel free to follow with questions if you like. I have some hobby experience with bows and have trained professionally (military) with firearms.