I agree with 'the gang.'

My brother and I fly together. We have a few two strokes and a bunch of four strokes. They all get the same fuel, which is 15% nitro and whatever oil the manufacturer uses. We usually buy 3 or 4 cases at a time and we choose based on price and availability.

We have used these brands and see no difference:
Cool Power
Magnum
Omega
Powermaster
Ritchs Brew
Wildcat

< edit to add copy/paste from Saito manual >
1. Fuel. For maximum protection and loogevity of Saito engines, Saito recommends a fuel containing 20% oil and 10-15% nitro methane. If this blend is not readily available, the next best selection is a high quality 2-cycle glow fuel, such as Hangar 9 Aero-Blend, Omega, Cool Power, K&B, Power Master, etc. Use of fuels composed entirely of castor oil is not recommended. A mix of synthetic-castor oil is acceptable and can be found in the various fuels described above.