Hi all. What is the best Disney Marriott property in terms of proximity to the park and transportation?

Trying to decide between Orlando Marriott World Center and the Springhill Suites in the Marriott Village. Two completely different properties, but each has its own advantages. We'll have a 3.5 year old with us, so a separate sleeping area may be key, and free breakfast, but Marriott pool is nicer.

Thanks in advance!