I'm not sure what "two" brands of fuel are being discussed but I have excellent results with nitrotane. As do my none sponsored friends. My one friend is absolutely the most neglectful person when it comes to maintaining his equipment and he got 8+ gallons from his last nitrotec engine!. Original bearings and never put after run oil in his motor. It's actually still running now.

I too never use after run oil with nitrotane and get great life and power from nitrotane.