Yes, I post in multiple places.
Grassblades has a main website and a tumblr mirror. I also post early-access pages on Patreon for $3-backers and up (backers are always 2 pages ahead of regular readers).
Of those, I prefer Tapastic and my main website - Tapastic because it has a lot more activity going on, with readers commenting and sharing the comic and hanging out on the forum and all that, and my main website because it's, well, mine. I have character profiles, etc. It doesn't look perfect, because what the heck do I know about web-design, but it looks okay, and it lets me have little extra-pages that Tapastic doesn't.
The Tumblr-mirror is only a kind of backup - and Patreon isn't really intended as the main reading-platform for my comic; it's just a place for me to give treats and extras to my backers. As soon as the regular sites have caught up with what's posted on Patreon, I take those pages down and only leave the extras.