I've used a lot of different film holders over the years, but only the following I have used extensively:

Fidelity & Lisco Regal II: For me the standard for production work. Use them several hundred times, and yes some of them will break or fail. For me the metal tops to the dark slides outlasted the plastic tops. Replacement OEM tape, to me, always outlasted other substitutes.

Toyo: A little grade better than Fidelity & Lisco Regal II.

Linhof: High quality German precision made. Could never afford new ones.... The ones I could afford, bought, and used were in rather (actually really) beat up condition but they never failed me.

Chamonix: My favorite. Dark slides in the ones that I have and use have always seemed to be a bit stiff to remove, but less so to put back.

Was wondering how others rated same and other film holders....