Here's the follow-up I mentioned. This is what I know about our options from personal experience:
Originally started as a successor to fatchan, which itself was a hasty bunker made for /v/ after old 8chan imploded due to mismanagement and/or federal agents. Run by Sturgeon and uses JSchan, a modern image board software.
It's a mostly good site, with probably the most usable /v/ board of any webring site (as in, it generates actual OC and contains good faith discussions about the hobby) and a few smaller boards like /tech/ and /vhs/ that are significantly slower but not totally overrun by retards. There were a few growing pains, mostly due to Sturgeon having never done anything like this before, but in hindsight the site has been quite stable and hasn't imploded over the years. It has been my main website for the last several years and I have come to like it a lot. I don't think getting a board there would be difficult.
However, I would be remiss not to mention that the site seems to be a popular target for derision among the rest of the webring - the admins are too harsh, the traffic isn't fast enough, they kicked my dog, etc. Some of this is true, but much of it is an exaggeration of the kinds of shit any anonymous image board. It doesn't help that zzz/v/, the de facto face of the website, has genuinely been the target of a handful of dedicated schizos/shitposters who want the site to fail. The most famous of these is Eden, the former BO of prolikwoah/geimu/ who spent at least one and a half years shitting up game night threads, singling out people who were trying to contribute to the draw threads, and otherwise killing the vibes (and apparently he may have been a janny on 8moe/v/ at one point? unsure; hadn't heard about it until yesterday). There are less obvious ones too, like the guy who bumps months-old threads with single-sentence posts for no reason, and probably a couple I'm forgetting. I imagine most of them are /b/tards who want a new playground to cover in their own puke.
the smaller boards do not seem to have this problem, though being in proximity to it does mean they get the occasional faggot blowing through. I don't think this is actually in excess of the usual image board autism.
The /a/ bunker which has been used since /a/'s retarded word filter banhammer bot HoiHoi caused so much traffic on old 8chan that it made the entire site unusably slow for months on end (HoiHoi is actually optional, and you can simply disable it in board config settings). Uses Vichan, which is the "standard" image board software you probably all recognize from 4chan and old 8chan. Run by the meidos, a cabal of very competent but holier-than-thou admins who have an eternal unspoken Rule 0 that allows them to delete anything, anytime, for any reason. You will
get your good faith posts deleted, you will
appeal the ban, and you will
be told to fuck off.
The actual /a/ board used to lord its "high quality posting" over the rest of the webring, until it was discovered and popularized that the kohi thread ("coffee" house, or general and semi-off-topic) was housing a significant population of genuine homosexuals who enjoyed posting pictures of their anime girl cosplay and dildo collections. They now have their own board and /a/ is significantly slower as a result.
Overall, it's /a/. Slow, lots of rules, and too obsessed with current seasonal anime, but mostly devoid of shitposters other than the specific type of shitposting they condone. I know that /tg/ settled there with a disabled HoiHoi and have generally done well for themselves, though they never quite recovered from the user drain and are now a quite slow board. But there are a handful of dedicated graybeards posting updates on their own campaigns and personal projects, and some very long threads devoted to particular systems or on-board campaigns.
smuglo.li has a few other small boards which I think have done decently for themselves, but I haven't visited them so I can't claim I'm informed.
The /animu/ bunker. A complete hive of shitposters with zero moderation other than the bare minimum to remove CP; there used to be moderation but allegedly the website admin got his dox found out/hacked by a few shitposters who have threatened to release them. Achieved brief infamy when the site's /2hu/ (Touhou) board colonized julay/v/ and turned it into a loli board.
More lax than /a/ but way less stable and reliable, and the stomping ground of more than a few schizos who enjoy naming each other and derailing everything that isn't a dedicated general. The only good thing on the entire board is the kemono thread, but even that has seen a huge upswing in homosexuality in the last six months.
As with /a/, there are smaller communities on the site but I haven't ever visited them.