Mountain Lion vs Mavericks

OS X Mountain Lion 10.8.4 vs OS X 10.9 Specs: Both "computers" have 2GB of RAM, 64GB of Disk Space, 128MB of video memory, 2 CPU's each running on an Intel Core i5 processor at 2.3GHz. --The results here may not be as accurate because of course, they are running on the same computer on a virtual machine and the current OS X Mavericks release is marked as a developer preview, so, is not the final version.