Mojave
Member
GemFan props are cheaper since they spend less time balancing and calibrating them at the factory. If you want quality props that are actually factory balanced, I think T-Motor makes some of the best. I found this comparison review between GemFan vs. T-Motor Carbon Fiber props: https://www.youtube.com/watch?v=1CHKGLl00Ks , pretty explanatory.
This is what I would recommend: http://quadcopteruniverse.com/collections/propellers/products/10x3-3
Don't be fooled - even though the T-Motor CF props are balanced, and I pay a lot for their 18 inch props, they still need to be balanced. I may have every sixth one that does not need much balancing, but you need to check them all. I find the hubs are particularly difficult!