I use an Arca with the rotaslide back, having never used a different option I can't tell you if its better or not than the alternatives
what I can tell you is I cannot imagine working without one, composition is simple using the groundglass.. then just slide the back across.. if its portrait you can rotate the ground glass accordingly and the back, the masks that came with it were pretty useless, so I used gaffer tape and measured the difference,
landscape is perfect, portrait requires 2 clicks of front rise to get it bang on..lol.
live video I find is useful occasionally over a product table, but much slower than your eye. and outside it doesn't work.