There are a lot of good oils, a few of them the same as another one under another name. Mobil, Pennzoil Air Cooled, Belray MC-1 and H1R (different ratios) Motul 800, Redline Racing Oil, and quite a few others. A fair percentage of the natural oils are excellent choices as well if the ratio is watched. I like the way Stihl and Echo oils perform. Too much of any of them increases carbon build up, with the naturals being the fastest. I won't be the one to say which oil is the best because too many are very, very good.

Ratios vary on the weather and type of operations. For 3D with a lot of hovering and stuff I'd use a little more oil. For IMAC, 50 down to 70-1 would work most anywhere. If the ambient is really hot then add more oil. If it's really cold you can go with less. Generally I still run mine at ratios of 70 or 80-1 until it gets hot outside, then it increases to 50-1. If you're goin' racing, more oil is even better. If the engine is tightly cowled and gets little cooling air more oil helps. There are a lot of factors that determine what you need for a mix ratio, the manufacturers recommendation being one of them.

Properly adjusting the carb needles for the oil quantity is also important. Rarely can you change an oil ratio and not need to re-tune the carb.