Reading FFN is "scrapping the bottom of the barrel" for me. Like I'll go there if I mine out a fandom in AO3, but it's definitely not my starting place.
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Some of the older fandoms started out there and it existed when majority of the internet users are younger and just starting out so I can understand the quality. Some of my older works are still there and I cringe at them. But that said, there are some hidden gems in FFN not otherwise seen elsewhere.
Almost everything is on Ao3 now for me. It's just ridiculously easy to read how I want, organize my fics, etc and of course very easy posting. I'll go on FFN when I run out of fic for a fandom on Ao3 though. There are a few gems that haven't been crossposted, so I go fight against FFN's cloudflare to download them with FanFicFare lol.