Three tire choices (all with Vittoria latex tubes and 30ml of sealant)
Wheels Zipp 404 front, Flo Disc rear
1. Continental Supersonic 23mm / Continental TT 23mm
2. Continental TT 23 front and rear
3. Continental GP4000SII 23mm front and rear
What do you think the best choice is and why?
From your list of Conti tires:
Assuming this is the pre-2017 23c SS, then this tire F/R is likely the fastest combo if you aren't worried about not having a Vectran flat protection belt.
I would not run the 23c GP TT up front as it mounts up very wide. So I would combine GP4kII 23c F/GP TT 23c R for a Vectran flat protection belt option.