I think Squarespace is really slick and easy to customize, and it has many beautiful templates. I have used it before but for portfolio work. It is a paid platform, though, I think it's like $12/mo. I am considering it for my own comic after I've uploaded a few chapters.
Wix is free and I think it resembles Squarespace in some of its design themes and how you can customize the layout. It might have ads, though, to compensate for not costing anything.