24mm Cap Feeders specification should start with the real closure.
Many 24mm caps look similar but behave differently because of skirt height, ribbing, tamper bands and liner details. The feeder needs to keep the cap stable through the bowl, chute and capping handover.
For a better buying decision, the useful comparison is not only hopper size or headline speed. It is how the feeder behaves with your closure, how the capper receives the cap and how easy the line is to run after changeover.
The safest specification route is to start with real closures, target output, line photos and the exact point where the cap must be presented. That avoids choosing a feeder on a generic speed figure that does not match the cap or capper.