For me Dew or Dr. Pepper (When I drink soda)
A&W Diet Root Beer or Creme Soda
None of it!
Tried diet dew and coke…not for moi.
Same here Bob. Just about all I have tried that my wife gets, they’ve all had bad after taste’s as soon as I swallow it. 
Pretty flat/bland as well imo with no sugar. I’ve been hitting 7 up here lately to keep away from the caffeine. Doc told me to stay away from caffeine per my blood pressure.
I use to drink diet orange Crush. Thought it wasn’t too bad.
Coke zero
The best of all time was TAB ! Tasted good, no after-taste, no possible poisons.
Dew
Diet Dew
Coke zero cherry