I have nothing against other sites but for myself I'd rather create my own personal website to retain editorial control of content.
When you post on someone else's site they basically own your content and can profit from or delete it whenever they want. It becomes their journal, not yours. You are also limited to their layout style as well.

The upside of a personal website is that you control everything about it, which is great for a creative person. The downside is a bit of a learning curve and that exposure is limited to how much you promote it. For me that's an ok tradeoff as I want an online destination to direct some people to but to have the look be all my choice rather than having lots of random strangers reading about my stuff on someone elses platform.