Certainly supports up to 120Hz (I run that at the moment), I can imagine the 144Hz monitor will support it too.
Also, to clarify: What SVP does is interpolates the standard 24fps (or whatever the original video frame rate is) to the highest refresh rate your monitor can handle, in my case it's 120Hz and in most other people's case it's 60Hz. It does so by blurring frames 1 > 2 into 1>1>1>2>2 (for 120Hz, for 144Hz it would be 1>1>1>2>2>2). This gives the illusion that the video is playing smoother because it is eliminating the obvious jumping between frames.
Bit of a hijack but I am an avid user of SVP and I think it's brilliant - definitely give it a good go.
But to answer your question - I'm an advocate of higher refresh rates, so 144Hz gets my vote. General use does feel snappier and smoother, and you can notice a massive difference with the cursor.