@s-onorous I post mainly on AO3, and it's worth it to bring stuff over to Wattpad. Wattpad is a little more intimate/ easier to interact with readers than AO3 and it's a different audience. I bet people here would love to get a glimpse at what you've got on AO3. Unless you're really busy and don't have time to crosspost, there are few cons to crossposting. I do advise, though, to treat each work in AO3 as its own story here on wattpad. You'll get a bit more traffic and it will give your readers a better idea of each work if they're each a separate story rather than posting them all under the same story as different chapters.
Anyway, good luck o/
<3 Kencha