Thanks for posting that comparison, and it's nice to see Lee Valley getting a plug as well
I have a scad of different brass ones, mostly Nelson's but a few others too (forget where they all came from as I've had 'em since forever), most of them fit together just fine (but a few don't). Do your Nelsons, Gilmours, and Dramms interchange?
I too have been playing around with the large-inner diameter Gilmours, but I've been using the plastic ones. Even with my boosted pressure the larger ID makes a differenece, especially with the foamgun.