IDK about the Vermeer grapple, as I've only looked at it.
There is no bollard on the Vermeer.
Unless the rotator has a 'drift' position, I can't see it feeding a chipper very well, needs some 'give', in my Limited experience. I've fed my chipper lots, and it's a chuck and duck. A hydraulic machine would be easier to feed, but 25% heavier for similar productivity. I tow my chipper a lot. IDK if you can do that with any other grapple. I have yet to use my dedicated hitch-plate on my mini, just the BMG Towing Receiver.
People also process brush according to the gear they have. People develop tricks around the gear they have and the brush/ logs that they deal with.
If I could only have one, I'd go BMG. For August's crew, ironed up with competent operators, I'd like both.
He has shown a few tricks I have more trouble doing with a BMG, like grabbing a near-vertical log coming down on a rope. Vermeer, anybody could do it, I think, BMG the swing move is for more advanced operators.
I've rolled some huge logs on flat ground with the BMG's horizontal tube, where the Ryan's and Vermeer's pusher-head thingies would be in the way.
BMG Scoops. Heard the testimonials
BMG rake. Heard the testimonials.