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Depends on the server configurations. A VPS on a low-spec server is likely not going to perform anywhere near as well as a shared hosting account on an high-spec server. Plus you have to remember, with shared hosting, you are almost always (perhaps even 100% of the time) getting a control panel of some sort (normally cPanel or DirectAdmin) with your account. With a VPS, you are going to need to purchase a license, and a 256mb VPS is not going to be enough to run any of the popular panels, so you are going to have to bump up the specs on the VPS.
The most important thing to remember is that a VPS IS shared hosting. I know the industry terminology is that there is shared hosting and VPS, but in using that terminology, people forget that VPS is on a shared server, with all the other users sharing the CPU, disk, etc. Yes, a VPS is more isolated than a shared hosting account, but it's still sharing resources with other VPS containers on the server.