HostPro advertises around 99%+ uptime and runs KVM-based VPS, which is pretty standard. In practice reliability depends more on the specific node and location than the virtualization itself.
If uptime is critical for your store, I’d still recommend…
As far as I know (not from my personal experience though), GTHost instant servers should be fine for that kind of workload. They’re generally known for fast deployment and decent network performance, but exact disk I/O and throughput can vary a bit …