Closure Feeding Systems specification should start with the real closure.
Closure feeding systems need to deal with the real production closure. A pump with a dip tube, a trigger sprayer with a handle and a flat screw cap all behave differently in a hopper or bowl. Sample testing and a clear handover requirement are essential.
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.