When image quality is important for you, then the Samsung CFG73 currently probably is the best (VA Quantum Dots).
I don't have tested of course ALL TN 144Hz panels with freesync, but my personal favorite so far is the Viewsonic XG2401 followed by the LG 24GM79G (the LG has a bit worse dynamic range in darker grey steps but it offers LFC and blur reduction compared to the Viewsonic)
Which TN panel you have used before? I think newer TN panels will be better since I also have an old 27" 144Hz panel from Samsung (one of the first releases) and their image quality is far better.
According to the motion blur, the Samsung CFG73, of course, has more, but the Samsung still will be much better than your 60Hz panels. The only one thing what the Samsung can have worse is smearing (bad black to grey response time) which means = dark objects behind darker backgrounds will have smearing / motion blur / overshot issues