Lint/Dirt or coins in the slot is a non-issue
This debate is almost as good as the Chevy/Dodge issue, or the auto vers revolver issue. Those that like Centennials will do anything to show how it is superior.
The lint/dirt/stuff in the slot noise is just that - noise. If you put your gun in your pocket and look at it in say, 5 months, then the dirt issue is prolly real. If you take it out on occasion, like daily, when you take your pants off, and inspect it (afterall, you are risking your life on it!!), then dirt is a non-issue. If you forget it is in your pocket and put a handful of coins in there, you should probably re-evaluate your need to carry a piece.
The Bodyguard has a real advantage to me, and it isn't single action shooting, although having that option is not a negative. The advantage is this, you can do a real live function/rotation check after loading, WITHOUT pulling on the trigger. Just pull the hammer back a tad and rotate the cylinder. You cannot do that with a Centennial design. For that, you need to pull the trigger, which to me is asking for trouble. High primers are not really an issue these days (with quality ammo), but excess oil or dirt under the extractor star can still tie up a revolver. So, you can argue all day which is better, doesn't matter. They are both available in steel or alloy materials, same weight, etc. The Bodyguard has some extra capability, which in no way can or should be treated as a negative.
Chose which one you like and stick with it.
.......SmithNut