Just interested to see what people prefer for 3D flying, my style is generally fairly slow / floaty 3D but I like quite a bit of instant power which often gets me out of trouble as you can point the nose to the sky and lots of throttle but interested to see what others prefer.

The type of planes I'm using them on are 360 to 420 gram foamies and they're SF props.

Generally speaking, the 10 x 3.8 would be better for that style of flying. However, in some situations (electronics and airframe combination), the 10 x 4.7 would work better. They are cheap, so I would just buy both sizes, try them, and use the one that works best for you.

I have just ordered a few more today but as just interestede to se what other people thought, I have the same motor on different planes and one produces quite a lot more wattage with the 4.7 than the other with the 3.8

My son flies the Extra 330 SC and I was wondering the same thing. What's the best prop for 3D and that plane?