I tried the 16/19 yesterday. Strung with Wilson Sensation.
I have to say i like the 16/19 more then 18/20. 16/19 have more power, more response in the stringbed. The tighter 18/20 is a tad stiff imo and its much easier to play with the 16/19. For me, the choice is easy
Only downside with the 16/19 version is the new wilson-grip "sublim" or what its called. It is the worst base-grip in tennis history. It must be a misstake or something. A bad batch. If you are a player only using the base-grip, remove it straight away, dont even try it. It gets slippery after 2 minutes
No Guts, No Glory