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I use both Xen and KVM. From a users perspective - I see no difference. Both give you access to the kernel, unlike ovz.
Edit: There are two kinds of Xen and you need to know which one you use.
tldr; - You want HVM not PV
In my head - HVM compares to KVM, and PV compares to OpenVZ
Here is something from the Xen Wiki at http://wiki.xenproject.org/wiki/XenOverview
KVM all the way! Depends on what you need, KVM usually comes at a higher cost.
Before KVM became popular, the VPS virtualization of dedicated resources was Xen. Xen has many similarities in resource allocation and KVM, but the configuration adjustment is not very flexible, and the performance gap is not very different. Now Kvm has occupied the market. After all, Xen is too old.
If you have used Linode's early VPS service, you will understand the difference between Xen and KVM.
For your purpose ("I want a VPS/VDS") there is none that is significant. Personally I like XEN better for reasons that are not relevant to the vast majority of users, but I happily use KVM too which has the advantage of a huge community and crowd supporting it.
and still stable and support all OS, compare to ovz old version had limitations.
FYI HVM isn't really used anymore by Xen, it's instead just a custom version of quemu (KVM) that's setup to better run under the Xen environment and can be managed by xen tools. Functionally, there is almost no real difference between a KVM server and a recent Xen HVM instance for many versions now. The biggest difference with Xen is that is also provides the option to run your servers in PV mode (paravirtualized) which if your system is going to be Linux based will have a lot less overhead than HVM (KVM) will. So the gain from using Xen is that you can not only use full KVM virtualization but also run PV hosts at the same time in a mix. This can be nice if your running mostly Linux systems, as utilizing PV can cut down on resource overhead and can also provide slightly more performance as it balances CPU and IO resources a bit better (differently). For this reason, I actually prefer Xen for my stuff as I run mostly Linux based servers.
my 2 cents.
Cheers!