From the Helix web site:
The 10 speed derailleur is the highest performance model. It offers a wide range of gears that allow you to climb steep hills and also ride fast. It requires the most maintenance of all three models.
The 11 speed Alfine offers the simplicity, clean look and low maintenance of the single speed with slightly less performance than the 10 speed. The gears are fully enclosed and away from the elements making it a good choice for wet conditions. It is however the heaviest of all three models.
I was wrong about the internal hub requiring more maintenance. Since I am accustomed to derailleur system and I don't care about the above mentioned advantages of the internal hub, I will downgrade, but I would still like to hear opinions about this. Thanks!