Power
The lower power consumption, and weight/size reduction will be useful for anyone wanting to use it for robotics projects (the "A" was already very popular for this).
It is tempting to think the "B" (or "B+") is always better, but it does depend on what you want to do with it, sometimes the "A" was better, I think for most of those times the "A+" is quite the upgrade.
Biting the hand that feeds IT
