When I'd finally finished updating my AO3 account I would still post directly to LJ but add a link to AO3, and link to both on my LJ masterlist. For posting fic I like that AO3 has the function to see hits and kudos, and I like the look of it, all clean lines and clarity. I think maybe you miss out on some comments though, because kudos are easier to give, and on comment conversations, which seem to flow better on LJ? But I wonder if i'm wasting my time if I post directly to LJ, because I think there's a trend towards reading more on AO3?
As a reader I've noticed I tend to opt for an AO3 link over any other kind. If one isn't available I'm happy to read anywhere else - stores are love - but other people's journal styles, for example white writing on a black background or a tiny font, put me off now I'm used to the AO3 layout. It's also much easier to bookmark things, find other things written by writers you've liked or works that they've liked, and to search.
I still really like rec lists though. If I see a rec list on LJ - or recs elsewhere, to be fair - by someone who's I trust to rec things I'll like, or if a rec list just looks interesting, I'll go through those fics regardless of whether they link to AO3 or anywhere else. But similarly I'll go through someone's bookmarks on AO3 if I like their taste.
So, posting habits and reading habits these days. What're people's thinky thoughts?