Me?
Personally, I hold the comprehensive GOAT tennis shoe is the Breathe Cage II (best cw either Del Potro 2008 Masters Cup or Nadal 2009 AO).
But if I were to highlight either of the two aspects you mentioned:
1. Performance - BC2 (2nd & 3rd place some order of the Lunar Ballistec and Zoom Vapor 9)
2. Style and Flair - I have too many favorite cw’s/models, there are so many GOATed Fedal combos, but my short(/long) list includes:
- Roger’s AO 2012, 2017 / IW+Miami 2014, 2017, 2018 / French Open 2010, 2012 / USO 2011-2014
- Rafa’s AO 2009, 2014, 2017 / FO 2010, 2016, 2019 / USO 2010, 2011, 2017
CB2.3 USO 2010 is the shoe that got me into collecting, but my current favorite is the Black/Teal AJ3 x ZV9, so it's really tough for me to just pick one, ha