I voted "blend" but just dropped a full-syn in favor of a blend. I had Pennzoil Platinum in it before this last change yesterday, and I went with Schaeffer Supreme 7000 5w30 syn-blend. I've never seen a bad UOA with Schaeffer's oils, and the first thing I did notice this morning that was different was the infamous timing chain clatter the SOHC engines have before they get oil pressure was completely gone. It started up just as quiet as if it had been run earlier and restarted.
We use Schaeffer oils exclusively in the race car, and have never lost an engine, except for the one that had 3 1/2 years on it and dropped a valve. The bottom end still Plastigaged out perfectly.
Other racers running different oil tend to have more problems, I've noticed.