SSD In Macbook Pro

I have a Macbook Pro that runs terribly. I have a MacBook Pro (13-inch Mid 2012) with 10GB of RAM. Do you think upgrading the drive to an SSD would make a HUGE impact in speed or just marginally? Wanted to see your guy’s thoughts since a lot of you use Macs. Another option is to install OS X on my Surface Book 2 instead of Windows.