Minibuses are generally better for a quick city tour. Minibuses have only 15-35 seats, but charter buses have 40-56 seats. A charter bus is a private rental of a motorcoach. Mini buses are designed for short-haul rides, often lacking facilities such as restrooms, Wi-Fi, and seats. But a charter bus provides different types of facilities, such as restrooms, Wi-Fi, and charging booths. So a charter bus is best for Washington.