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I'll be using whatever 0w-20 oil I can get on sale. This time, that was Castrol Edge...next time, who knows.
The difference between commonly available synthetic oils will be statistically insignificant over the life of your average engine, especially considering our cars are naturally aspirated.
If you track the car, then choose an oil to match. Even then, the primary concern is viscosity. Toyota/Subaru specified roughly a 5.2-9.3cSt (20 weight) oil for this engine, so choose an oil that will fall within these specifications at the oil temperatures you are likely to see. For a street car, this would be your average 20 weight oil. If you track the car, and see higher oil temperatures, you'll probably need to step up to a 30 weight or even a 40 weight oil.
A 40 weight oil at 212 degrees F (common temperature on the "street") will be around 14cSt. This same oil at 266 degrees F (common temperature on the "track") will be around 8cSt.
If you use an oil cooler, then everything changes.
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