Cam, jam, clam - I think there's confusion about each. ,,,,, I don't see how "Clam" describes them. The line is "Jammed" into the cleat. I think that's a much better description.
I think "Clam" is a trademarked name for the company that makes those particular cleats. Ronstan, for instance, calls their version a "vee" cleat.
Also, a "jam" cleat was the original name for a horn shaped cleat with one of the horns tapered underneath to allow "jamming" the sheet for quick holding. The cleat is located aft of the winch with jam end facing the winch, so the crew pulls the tail around the rear horn and pinches it under the forward one while still in grind mode. Makes for a quick set or release when trimming. Once trimmed the sheet's tail is looped around the rear horn to lock it down.
Cam cleats are what I would want. Put an eye on it and a stopper knot and I think you have a pretty good system.
That's my choice too. On my boat, which has the winches canted out a bit, the cam cleats are on risers to give the sheet a level exit from the drum. I do not use fairleads on the cam cleats. The sheets are entirely free to run when released from the winch. The open nature of it allows quick setting and release, no chance of a kinked line getting caught in the bulls eye fairlead.