Hey .. I have been looking at both. Im a Business Analyst rather than DevOps so I went for Yunohost.org as it got me something running more quickly rather than Coop.Cloud but I can see the different use cases.
Can I ask why you described your install as Crufty? What issues have you run into hauving Yunohost for a while?
It feels to me (Without direct experience running Coop Cloud bit more looking and chatting ) that its more aimed at provisioning multiple instances for multiple customers across multiple VMs rather than Yunohost which seems like more of a - This is one instance on one server/VM
There is a part of me that likes the user admin features/ GUI of Yunohost and wonders whether people managing multiple organisations across many VMs would want to wrap Yunohost inside Coop. Cloud - but im all new to this.