Devo 10

Any advantage to going with Devo 10 over 7E beside Devo 10 having 3 Flight mode (flip switch adn longer range for working with Deviation. Seems less mod needs to use on Devo 10?

There is a substantial advantage - Devo 10 is more "future-proof" than Devo 7E. We love Devo 7E for its low price and small size, but unfortunately the MCU inside it has less memory and is on the brink of impossibility of adding features to it. Expect builds with less features for Devo 7E in the future. Devo 10 is OK in this sense.