Damper is just a bit of rubber - some softer, some harder. If you shoot light weight then a softer damper will probably work better. If your bow is already vibration free and quiet the. You might not need a damper. The softer the rubber, the more the weight moves (+/-) the more it moves the more difference it makes but that can also affect how the bow aims as it will amplify any tremor coming from you. Slightly over simplified because sometimes one damper just works better with your particular setup.
Of the dampers I have tried from stiffest to least stiff:
Beiter vbox - anything from 3 rubber up (which can be varied)
Doinker A-Bomb 1”
Fibrebow (theoretically can be varied but seems the same to me)
Doinker Supreme (which can be varied)
Doinker A-Bomb 3/4”
Fivics (with the coloured bands)
Original doinker
Beiter (with softest rubber option)
Flex
Rubber high pressure hose with machined fittings (very 1990s)
I’m an old duffer with broken bits of body that often gives me a little (mostly) tremor so I tend towards the top two.
In summary, pick the one that looks best on your rods and works with the thread of the weights you use. Everything above the Fivics works well on all my bows and all my stabilisers. (Fibrebow can be a bit picky - go figure).
Stretch