I personally prefer Hyatt House over Hyatt place when with the family. Hyatt The Pike Long Beach is nice & is walkable to the Long Beach Aquarium and nice restaurants. They also have a nice rooftop pool.
Hyatt Huntington Beach is a true resort property. Multiple pools, restaurants, kids club & spa.
If you are looking to relax after I would choose Huntington Beach. Try Rudys diner on Huntington Beach pier.