I've never actually tried TTSMS. Didn't really know what the difference was between the two. Now that i try to load the TTSMS plugin it throws errors on load & can't get it loaded into commands. Both win 8.1 & 10. So, I can't say if it sounds better. It's the new Cortana voice, just thought i'd try something new. It sounds better to my ear than David or Zira do. There's also a new Mark voice that i'm working on unlocking.