There are two main types of safari vehicles used for the Safari in Kenya - Safari Van and Safari Land Cruiser. The right vehicle to use depends on various factors such as the destinations you want to visit, the month that you are visiting, the budget, the experience you are looking for, etc.
Safari Van is the best option if you are on a tight budget. However, if you want a classic safari experience, a Land Cruiser is always recommended. Both Safari Van and the Land Cruiser are designed to accommodate seven people. Every person will get a window seat, and the roof is detachable in both vehicles.
Here is more information about the vehicles.
Size: Physically, the jeep is bigger. Hence it is more spacious. Since it is bigger, it has better suspensions which means a pleasant traveling experience.
Off-road: The Land Cruiser can get to more inaccessible places than a minivan, which means during wet seasons, some places will be hard to reach with Safari Van, but Land Cruiser can access those places. Both vehicles are allowed to go off the "track" to get a better shot or to get close to animals.
Shade: The roof lifts but does not come off in both cases. It is necessary for game viewing and easy photography.
Comfort: Both the vehicles are quite comfortable. While the Land Cruiser has bigger suspensions, the vehicle will not be shakier. The minivan has a smaller base hence a little shaky during travel.
Here are some photos of the Safari Van and Land Cruiser.