The vehicle that goes where the stretches cannot
This is the honest answer for a lot of trips that people ask about in a stretch. Kanan Dume Road to the Malibu coast has three tunnels and an eight percent grade over its final three miles - a super stretch is not going down it and a Sprinter is. The same is true of tight canyon venues, hillside wedding sites, gated streets with no turning room, and mountain roads like Highway 33 up to Ojai, which is two lanes rather than freeway for its final fourteen miles. If the destination is awkward, this is usually the vehicle.
Three builds, and which one you want
The executive shuttle is for corporate groups and coordinated transfers - it is the sensible vehicle for moving a team to an airport or a client site. The limo build sits between an executive interior and a party one. The 12-passenger party configuration has LED lighting and is the one for a wedding party or a group that wants to travel together without a full super stretch. Say which job the trip is when you enquire, because the same model name covers all three and the wrong one is a wasted booking.
High roof, and why it matters more than seat count
You can stand up in it. That sounds minor until you are getting a wedding party in and out in formalwear six times in a day, or moving a corporate group with laptop bags and roller cases, or loading a group of twelve at a kerb in the rain. Headroom is what makes a Sprinter comfortable at a capacity where a van is not, and it is the reason it gets booked for wedding parties and guest movements rather than only for airport runs. It is also why it suits a group with anything bulky - instrument cases, sports equipment, camera kit - where a limousine seats the people but not the things they brought with them.