[QUESTION] IMAX 15/70 mm Projector Differences?

Hi, IMAX noobie here. What are the difference between these projectors? Kinda just lay it out as if I was a 10 year old. Which one is the best one in terms of picture quality (if there is a difference).

• GT: IMAX 15/70 mm 2D film projector.
• GT3D: IMAX 15/70 mm 3D film projector, dual rotor.
• SR: IMAX 15/70 mm 3D film projector, small rotor.
• GT Dome: IMAX 15/70 mm 2D dome film projector.
• SR Dome: IMAX 15/70 mm 2D dome film projector, small rotor.