All the oils do a decent job. Way more important is that you change it regularly, especially for airplanes that do not fly several times a week. I change the oil in my Grumman AA1B every 6 months regardless of how many hours it has flown.
After six months the oil will be full of nasty acids, combustion byproducts, lead, etc etc, none of which is good for you engine.
I use Philips 25W60 in my Nanchang. I find that unlike straight 100, you get instant oil pressure as soon as the engine starts and it takes about half the time for the oil to reach operating temperature after start, compared to 100.