1.0 will be rolling out on cloud sometime this week feel free to reach out to cloud.support@rocket.chat if you’d like to be among first.
Currently unless explicitly requesting to be held back everyone is updated. So as far as cloud you always jump in at the latest.
In general I’d always recommend the latest stable. All other releases are pre 1.0 so not guaranteed to get patches either. Though in general if a major security issue pops up we do update the last couple of releases if you just don’t want the latest stable for some reason