100% Tapas- this from the perspective of somebody who posted to wattpad for six/seven years
While great to begin with (when I started there in high school), wattpad has completely fallen apart due to constant crappy site changes, a growing population of tween girls and their pornographic, fetish fanfic, and a disgustingly caustic community.
I have seen users make actual hate books against people I knew personally.
I have been cussed at for not posting a chapter for TWO DAYS. (I haven't posted in months here other than updates on my health and my readers have been super sweet).
It's also gotten extremely hard to be noticed on wattpad unless you're writing porn, fetish fanfic, or the same bs bad-boy-meets-good-girl/boy stories as everybody else.
It took me three years to build up to 3k followers on my most recent account (shut down three others to get away from caustic 'fans' including one who decided to rewrite my entire story for me). I've been posting to Tapas for about a year and a half and have more fans than that- and tons more genuine fans who are sweet, understanding, and interactive.