Hello,
Both are good options, but definitely
Hyper-V will provide you better stability and performance because it is a
hardware Virtualization. So you get dedicated resources with it, it works as a Dedicated sever and it is not possible for us to take backups of Hyper-V VPSes. You can schedule backups from your VPS control panels on our remote backup servers. We will help you to configure it.
Where we uses
Virtuozzo technology which is a
software Virtualization method on
Semi-dedicated hardware nodes. Here you gets
Virtuozzo Power panel to manage your VPS services, backups, stats and other VPS related options. Also we takes weekly backups for all our Semi-dedicated hardware nodes.
Well, we keeps
40% of free resources on all our semi-dedicated and Hyper-V hardware nodes, because it is recommended by
SwSoft and Microsoft respectively. Both packages are having high configurations, so we create less number of VPS on every node.
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Best Regards,
EukSam 
UK Web Hosting, Website Hosting, Web Hosting UK, Web Hosting