ALUA and how you do distribution among paths are two seperate mechanisms.
ALUA handles failover from Active Optimized paths to Active Non-Optimized paths.
Load distribution over active paths is a seperate issue.
In general Round Robin is the default from clients and a Common Practice...
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff, Sr.
Independent NetApp Consultant http://www.linkedin.com/in/eugenekashpureff
Senior NetApp Instructor, FastLane US http://www.fastlaneus.com/
(P.S. I appreciate 'kudos' on any helpful posts.)