Which simplejson module to use for Google AppEngine?
Functionality is probably the same for both, but I would use django.utils.simplejson, here is why:

google.appengine.ext.key_range.simplejson is not mentioned by any GAE documents so it may get removed at some point.
django.utils.simplejson has more probability to being updated along with django and it seems there is less change it will be removed in the future.
I'm trying to figure out which simplejson module to use. Having looked back through my project I can see in some places I am using a mixture of both:

django.utils.simplejson
google.appengine.ext.key_range.simplejson

Which should I be using and why?