Another vote for the BMW X1. My wife’s wheelchair goes in with ease (just folded in half, foot rests off) with the seats in the uppermost position. It also has a floor that is flush with the load sill and being a couple of inches lower than cars such as the Tiguan, loading is easier too (a factor that I hadn’t considered until we tested it). There’s also a metal protection plate over the sill to protect the car from damage.
Although on paper the Tiguan boot is bigger, that’s probably due to the extra height as the boot floor area is slightly smaller. My wife’s wheelchair goes in but is a bit tight and can prevent the electric tailgate from closing on occasions. The rear seats can be adjusted slightly to compensate for this and it still leaves a very large rear passenger cabin. The facelift Tiguan would be a no go though unless a space saver spare wheel is specified, as the boot floor is sunk into the well. Daft really. They’d be better having a level floor with a big storage compartment underneath, as the X1 has.