Shadow would be a better shooter between the two.
Also, I would need to correct one of the posters - CZ 85 Combat is NOT the same as CZ 85B; the "B" version has Firing Pin Block (B = block) while Combat doen't, giving it a better (crisper) trigger.
Shadow, as opposed to other SP-01s doesn't have FPB either, lighter main and recoil springs, crisp (no creep) trigger, better sights.
Even the frame is cut slightly differently.
You may have to double-check IDPA rules as in the past the guns with full dust cover were not allowed (e.g. SP-01); if it applies to you. IPSC is fine with the Shadow (not to confuse with the 'Custom Shop').