If you’re worried about results, then there really is no difference between spraying or rolling concrete sealer. The difference all comes down to price and speed. Rolling concrete sealer is less expensive, but it also takes longer. But if you already have the equipment to spray concrete sealer, then it’s a faster option. Of course, if you don’t already have the equipment, then it’s more expensive than getting what you need to just roll the sealer. There’s no wrong choice here, it’s just a matter of what you’re willing to spend and personal preference.