Cap Feed Bowls specification should start with the real closure.
A cap feed bowl is more than a vibrating container. The important parts are the orientation features, track width, discharge route and the way caps are prevented from stacking or nesting. The bowl must be matched to production caps and target line rate.
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.