I have lived in both Burbank and Santa Clarita, and my opnion is that the Best Burbank elementary schools are in defined areas.
These areas include the Burbank Hills located above Glenoaks Blvd and north of Olive Ave, along with the schools in the Magnolia Park area below Magnolia Blvd.
The schools in these areas do not score as high as some of the stronger Santa Clarita schools, but they rate well from the parents in the area.
Should you decide to pursue buying or renting a home in Burbank, I am happy to provide you with a more tailored description of the different Burbank neighborhoods and their schools.
You also might find the resources on http://www.greatschools.net
to be helpful.
Good luck to you and your family.