Almost all elevators come in the same appearance: automatic doors, buttons that light up, lifts that go up and down, and other things. However, there are still differences in passenger elevator for every brand in the market like energy consumption, aesthetic qualities, capacity, speed, durability, etc. That's why it's important that contractors seek out the best ones that will fit the needs of the people in the building.
Elevators are said to consume 2-10% of the entire building's energy bill, hence the need nowadays to look for the energy-friendly ones.
Also, another thing that one should consider is the size of the elevator; the people (or freight weight) capacity and the space it needs for the shaft or cabs and the internal ropes. Be sure to look into the details like this one because it's very important to coordinate the best size for the elevator, that is, according to how it will be used.
Aside from the size, also mind the number of floors your elevator will travel as some elevators are compatible for smaller buildings and some are actually made for buildings like the Petronas.
Select the quality products, those which are rated and more industrially used and the ones which offer exactly the specifications for buy elevator.