Ah but OSX uses was less resources to run than Windows 10. Significantly less. :/
I don't see how that's going to make the Mac a better, faster machine, not one from 2010 anyway. Thing is Win 10 was created with SSDs in mind. Sure it'll run on a HDD, but obviously better on a 7200 RPM than a 5400 RPM, and your machine has a 5400 RPM, as do most HDD based laptops.
The SSD is definitely the better medium for Win 10, and to boost the performance of most any PC, upgrading from HDD to SSD is the way to go, given how SSD prices have come down dramatically in recent times.
Put it this way, one of the first upgrades I did was from HDD to SSD, and the jump in speed and performance was significant... same CPU and RAM, same machine, same everything, just a more efficient medium for the OS.
As for adding a SSD, you could probably find a tech who would do it inexpensively for you, same with RAM, if you purchased it from his establishment rather than purchasing it elsewhere then taking it in to be installed.