Usually, provided the group actually fits in the midibus. Compare the concrete price estimates for your group size.
This varies by provider and is less standard than on a coach. Check this for each provider under the facilities.
This varies by coach company; for international journeys a coach is used more often because of the comfort on a long trip.
No. A coach is three to six metres longer and doesn't turn as easily. Put in your request where the vehicle needs to pull up, and the coach company will know whether a coach can get there.
Fill in your number and see what comes up. Some midibuses have more seats than the usual size and some coaches fewer; on your price overview you'll see per company which vehicle fits and what it costs.
Fill in your place of departure, your destination and your group, and compare the coach companies with their prices.