I have no experience with the OpenStack but I would be extremely surprised if anyone with any experience with the CloudStack switches over.
Last time I checked it out, the CloudStack had a homemade ORM, no messaging queue, windows line endings on nearly every source code file (primary deployment platform is linux, I don't find that encouraging) and worst of all, the test coverage was in low single digits. It felt like a project being run by a marketing team, built using contractors and absolutely riddled with bugs. That said, if you're planning to run a private cloud with it and don't mind it falling over once in a while, then it's simple to setup and get running.
Your account was created 4h ago, so I really do not know if this response is for real or just trolling. The CloudStack offering was one of the few that got traction in the marketplace and had several high profile production deployments, including major telcos, Zynga and GoDaddy. You can discuss many other aspects, but in terms of maturity it has always been ahead of the rest of private cloud implementations (and that was one of the reasons for the Citrix acquisition)
I didn't want to associate my main account to the comment because it was candid, negative and I don't work with the CloudStack anymore.
I last looked at it in December and they might've worked every issue out by now. That said, you're welcome to investigate every single claim I made, as of then at least, each concern I listed was still present. Marketplace traction or acquisitions are not going to change the fact that what you're dealing with is 200K lines of code with 5-7% test coverage.
"Mature" and "high quality code" are largely unrelated attributes. Given that CloudStack was developed as proprietary code this criticism seems unsurprising.
Last time I checked it out, the CloudStack had a homemade ORM, no messaging queue, windows line endings on nearly every source code file (primary deployment platform is linux, I don't find that encouraging) and worst of all, the test coverage was in low single digits. It felt like a project being run by a marketing team, built using contractors and absolutely riddled with bugs. That said, if you're planning to run a private cloud with it and don't mind it falling over once in a while, then it's simple to setup and get running.