I think boys look more handsome in formal as compared to casuals. In case of girls, i think casuals give them more attractive look. What are your opinions?

According to me a lot depends on the situation in which the person is.At certain places formals may look very odd and in some other get together the formals may be the only option.

I always wear casuals except for a big formal party. The truth is, I am not comfortable wearing a formal dress. I don't know why, but whenever there's a big formal party coming my mom and I usually quarrel.

It depends on the occasion you're attending to. For instance, when the occasion requires you to wear formal attire, of course you wouldn't dare to wear casual. Will you? Otherwise, both of these attires are good as long as you're comfortable wearing it.