Same here. PS is great for illustration (which is usually the focus for Marc), but CSP is hands down much more accessible for Manga and webcomics.
Even with their recent pricing shenanigans, I still love to use it.
By the by, it's very intimidating to upload your work for the first time, if you need any help, let us know. You should be able to upload to webtoon and pixiv with no problems.
I'm also looking to see what other sites we can upload to, and I know there are even online services that will upload your work to all sites (for a price) to simplify that part of the pipeline.
As a hobbist, it's usually better to chose a few (I only use webtoon for now, but I do plan to uplaod to other sites once I achieve a few milestones) and upload and manage them yourself.
Bests of luck!