The other thing you want to think about is velcro or self adhesive discs? If you're a hobbyist load up with a fairly coarse grit (say 80-120), be disciplined about cleaning with one of those sandpaper cleaning blocks, and then disc changing is probably a once a year job. But if you want to cycle through grits (you might think you will, but in reality hardly anyone ever does), or if you're a heavier user, then you'll be changing abrasive discs regularly.
Self adhesive is a faff. Heat gun, then acetone or lacquer thinner, then isopropyl to remove the residue, lots of rags and waiting for things to dry/cool, then on with the new disc.
By comparison velcro is super fast and convenient.
Problem is velcro can dub over the edges of the workpiece, only very slightly, but for critical operations any dubbing is too much.
You pays your money and you makes your choice.