sliders.
track ends do my head in – every time you take the wheel in and out you have to make sure its straight and the disc is lined up properly, and the chain tension is right etc etc etc. and thats before you start using those things to stop the axle moving in the track end.
FAFF.
sliders – set the tension once (ok, maybe again once the chain has stretched). undo the QR, wheel drops out. put wheel back in and do QR up.
no alignment issues, no readjusting the for disc. tension is gonna be the same each time.
sliders are easier than using a mech – nothing to move out of the way to get the wheel out.
can’t see ANY argument for trackends over sliders, ime (3 bikes with sliders, and 3 with track ends).