In terms of screen sizes, both have 7'' screens and both are equipped with Igo Primo as well. But there is a significant difference in the memory aspect. VMS comes with 2GB of RAM, while Hema, on the other hand, possesses twice the storage capacity, which is 4GB. The start-up time for Hema is around 4 sec, while it is around 5.6 sec for VMS. So, there are certain areas where both are comparable while in some areas Hema overshadows VMS, especially in storage. I think Hema would be a better choice over VMS, the rest depends on your usage.

I hope it helps!