Why should the difference be to the user? The inner workings are important to the creators - it loosens their dependency on an external proprietary firm. The interface matters to the users.
It's no coincidence that six out of ten in this list run on Linux:
It's no coincidence that six out of ten in this list run on Linux:
http://en.wikipedia.org/wiki/Comparison_of_mobile_operating_...
In a roundabout way it may actually matter to users in that it enables more competition and better choice.