I’ve never had to rent a bus myself, but I’ve been part of group tours where they used both minibuses and full-size buses. From what I saw, the full-size buses are way more comfortable, especially if you have luggage. I remember one trip where the minibus had to put some bags on the seats, and it looked like a hassle for everyone. Full-size buses also have bigger seats and sometimes even Wi-Fi. If I ever plan a big family trip, I think I’d go for the bigger option, even if it costs more. It just seems more relaxing for long journeys.