Vacuuming gives you maximum effectiveness when cleaning your hard floors. A broom doesn't pick up all the dust and dirt like a vacuum. Vacuums save time too. Vacuuming will help you prevent the dirt from marking the floors. Make sure you pick a vacuum that's good for hardwood floors. Some are great on tile but not hardwood.
Using a vacuum cleaner helps put the shine back on floors unlike a broom. Overtime it saves a lot of time when you're cleaning up. It's worth the money to invest in. You can relax about cleaning up huge messes.