If money wasn't an issue, would you put child in daycare or free childcare with grandparents?

Title says it all. I'm about to return to work and I want to put my child (13mo) in daycare to give him better socialization and opportunity to learn new skills and be stimulated. We are planning to enroll in montessori daycare.

My husband prefers to give our child to grandparents to save money but they usually just sit around all day and I worry about the lack of routine and structure. If money was not an issue for you, what would you prefer for your child?