The endless rig is ideal for tracking shots when you need repeatability.
If you need your shot to be accurate each time so you can have continuity for you action or you need the rig to work at an angle, go for a point to point rig. It can take a heavier camera package than Speedycam.
You have the option of live flying or you can pre-program repeatable and accurate flight paths. Speed adjustments can be made on the fly when running pre-programmed paths which is ideal for keeping up with action.