Are your splits faster on sliders than on stationary ergs?

Answer 1

Generally yes. The reason for this is the recovery - whereas with stationary ergs you have to move the entirety of your body weight back and forth, on sliders it's only the ergo, and even that's aided by the bungees. It's much more efficient on the recovery and also to a lesser extent on the drive.

The main inefficiency comes at the ends of each phase when you have to reverse direction. You have to apply force to change the momentum, and you have to apply that much more to change momentum of a heavy human body.

Rate is much easier to achieve on sliders, too.