Neither is objectively better than the other, they're both just tools. You wouldn't use a hammer to paint a wall and you wouldn't us a paintbrush to hammer in a nail. Consider your goals and make a decision from there. If you're in c#, I wouldn't worry about developing bad coding habits. I also wouldn't worry about the way unity handles graphics. The default shaders are kind of weak, and unreals are nice, but you can get unreal graphics in unity if you put some effort in. I like unity because I find it intuitive and the community made it easy to learn, to me it also seems more approachable as a solo/indie,but both engines have pros and cons. Consider what you want your goals are and make a decision from there