From what I seen, both sites have different preferences when it comes to the story they want to read. Short gag comics that update frequently tend to do well here. While on Webtoons, they prefer longer updates in a scrolling format. If you have nice colors, that's a plus. Also fresh comics on Tapas seems to get pushed down much quicker than Webtoons.
On a mobile perceptive, flipping through episodes is easier on Tapas so one page updates doesn't bother me as much. While on Webtoons, you have to either tap and press the arrow or go all the way to the bottom to get to the next episode, in which I would prefer that it's longer so I don't have to keep doing that.
Also, I feel like the Tapas audience is fairly polarized to reading BL or GL comics. You basically have a head start by putting those letters on your comic thumbnail. They often get a large following pretty quickly which gives them a better chance to be trending. Not that I have an issue with it, but it's quite noticeable when you look.
Your comic seems more suited for Webtoons imo. But it doesn't hurt to post here either. Goodluck!