My novel/story is originally published on my Neocities site, it can be read here: https://phils.neocities.org/katabasis.html
Tapas is actually just my backup lol
Comparing the two, I update the story on my website more often and leave more author comments. I can also make better use of formatting because the entire site is coded by me. IMO It's a little more engaging; it's how the story was originally meant to be read.
But on Tapas I can do more in the way of advertising and promotion, and send people who are already on Tapas directly to my story. Plus readers can subscribe and be automatically updated, which isn't possible on the website unless you use RSS.
In terms of engagement though, I'm not sure which one does better? I feel like it might still be too early to tell.