Acura Integra I has 3 mm longer wheelbase than the BMW. A longer wheelbase gives more stable and comfortable ride, especially at higher speeds. It also provides more storage space. But, cars having a longer wheelbase are not as maneuverable as those with a shorter length between its axles.
The Acura Integra I 1.6 113HP is 9 percent longer in comparison to the BMW Z1. The length of the car is important when it comes to driving comfort and room in the trunk. The Acura very likely will be offering to it's passangers more room for legs. At the same time the Acura will be better driven but the BMW Z1 will be a little easier to park because of shorter length of the body.
Number of doors
An owner of the Acura Integra I 1.6 113HP gets an additional door at the back of a car. It will allow him to load and unload luggage into a trunk in more convenient manner, especialy when it comes to things of big size. Passages of both cars who are to travel in the rear have to get in a car through a front door which requires folding a front seat.
The higher a vehicle is, the better is the comfort of boarding it and greater capacity of putting massive amount of thinks to it. The difference at the level of 70 mm to the advantage of the Acura is little and should not be really noticeable.