In fact, this is an illusion. The side bezel is actually almost the same.

As my perspective, 'side bezel' should include metal frame since it affects total device width. From your picture, S24U's metal frame looks thicker.

Or is it also illusion?

The metal frame is really thick, which is what I said before, the thickest side metal frame  in Samsung's history. I suggest you not buy the black version.

보통 베젤이라고 하면 전면에서 보이는 테두리까지 모두 포함하는 경우가 많으니까 엣지가 사이드 베젤 줄이는 데 유리한 건 맞아 보입니다