To quote Blaine from 2014, "The Savvy is an improved version after Novak refused to make a few changes to them to improve fit, installation, and function.".
That being said, you want the Savvy shifter, period. I bought mine from Savvy a few years ago, but all this time I was under the impression it was a Novak shifter they were just reselling. Either way, good to know I have the better of the two!