I’d pop by McPhails or Ziggy’s and sit on their sit bone calculator. That’ll tell you what size saddle you need (ie: 143mm etc.) and it’s free 
What sort of racing are you doing? MTB, Road, Gravel?
I’ve tried all kinds of saddles and by far the best (for me) has been the specialized power saddle. It’s worth trying…I run it on all my bikes (Road, TT and gravel)
The comp has a bit more padding than the expert which has a bit more padding than the S-works version.
Good luck!
