I've tried many, but have had the most success with the Default.   I use a simple dot for aircraft.   But when it comes to the Ostie, I just do better with the Default.   I do not even "zoom in, move sight up, etc."   I've gotten the "leads" down to a science.   
The only reason I mention this, is simple.   What works for someone else, may not work for you.   You'll have to practice and test a few sights, to find out what you are most comfortable with.