For free, you'll be getting one micro instance, 5GB of Cloud storage. There are 15 total Google services which you'll be able to run without paying anything. This VPS is made for people who want to build. It's not the place if you wish to make a WordPress blog. But it's ideal for those who want to use Google's vast resources to make something brilliant.
With VPS Hosting you don't share resources because you have defined memory and bandwidth allocations within your virtual environment. A VPS will give you far more bandwidth and disk space and ensure you are never compromised by someone else's website. It's also a more flexible solution if your website grows and you need to move to another server – since it's easier to move a VPS to a new physical server than to transfer the contents of a dedicated server over to a new host.
The force driving server virtualization is similar to that which led to the development of time-sharing and multiprogramming in the past. Although the resources are still shared, as under the time-sharing model, virtualization provides a higher level of security, dependent on the type of virtualization used, as the individual virtual servers are mostly isolated from each other and may run their own full-fledged operating system which can be independently rebooted as a virtual instance.