Higher voltage or capacitance ratings will increase the ripple current capability, which is very important in this application. This lets the capacitors run cooler and extends their life. Make sure you use capacitors designed for high ripple current! Most manufacturers have at least one type that is optimized for this.

Multiple smaller capacitors (of the same total value and rating as a single large capacitor) have a higher surface area / volume ratio, and this also lets them run cooler. They might be easier to fit into tight spots, too!