Cryptotalk
Cryptotalk was a very active forum where many members made contributions but most of it has been spam, probably due to Cryptotalk incentivizing posts.
Cryptotalk is dead now.
Even when it was active, most replies were of very low quality. Very disappointing.
Everything on Cryptotalk is wrong the template is not good the category is not well organized and worse it's being managed by Yobit a notorious scam exchange, they are good when they are starting out but eventually lose steam because they cannot keep up paying spammers, they have to stop their paid to post plan because of multi-accounting and too many spam posts.
Altcoinstalks
Altcoinstalks is very different from Cryptotalk as it's an independent forum, similar like Bitcointalk. I have presented quite a few researches on Altcoinstalk,
Very big issue of Altcoinstalk as well: it is focused on Altcoins and many useless Altcoins such like Tron or Ripple are shilled. Criticism of such coins is bashed.
Not a good showing to push such fraudulent coins.
Altcoinstalk is good and is considered the next forum after Bitcointalk but I guess the lack of incentives and campaigns on Alcoinstalks is the reason why there are not many posters.
I have accounts on these two forums but I cannot be active on Cryptotalk because they ban posts coming from my country and lack of time is the reason why I seldom post on Altcoinstalk.