Adding muscle is exponentially harder, but in my opion also more fun.
It's easy to modify your diet and create a caloric defecit, carb cycling and controlling blood sugar isn't an exact science and it isn't that difficult, I guess unless you're trying to get insanely lean.
Adding muscle is where all the work is, all the heavy lifting, the napping, the forced feedings six times a day, the extra food prep and dishes, the bloat...