RHEV, in my testing, runs the fastest. But its Achilles heel is that third-party support isn't as strong, and there aren't as many products that integrate well with it.

You're more limited in what you can choose – not that the available options don't work well, but brand recognition isn't as strong. So, there are a lot of metrics, marketing, and other non-technical factors that drive people's decisions. People buy stuff because their competitors or neighbors are doing it.

Other solutions, such as Oracle or IBM, are easier to deploy. The features of all are pretty similar. 

I previously used VMware and then Citrix. We made the switch predominantly because we wanted to consolidate licensing. We were using Citrix for our VDI environment and it made sense to shift from VMware to Citrix Zen because the licensing for the actual ZenServer was embedded within our DDI license. It made no sense actually licensing a product that we could actually utilize within our existing license. When you look at the budgetary figures and everything like that, VM ware is not exactly light on the back pocket.

In addition to using this solution, we are trying to move our CRP solutions to our other platform, SUSE Linux. All of our business applications are moving to Red Hat, although we are getting better support with SUSE.

We are using VMware and for a time, just for virtualization. Now we are going to work on clouds. Therefore, we want to move ahead with Red Hat to use either private, hybrid, or public cloud. We want our data center to offer cloud solutions for our clients.

We did use another platform, however, that was not suitable and we like to stick with Red Hat.

We have used Ubuntu Linux and some other editions.

We'd like to move to OpenStack for clients that are looking for an internal cloud solution that's private.

We use Windows, of course, and we also use Ubuntu for some other applications. For our core applications, however, we use Red Hat.

We use different versions of Linux including CentOS and Ubuntu. CentOS is very comparable to Red Hat because it is almost the same, internally.