the large hole R&R and Pratten are pretty close in hole size, when i check side by side, the left hand and right hand are a bit closer to each other on the R&R, but they are both very comfortable to me, i like the single body of the Pratten type body. there is a difference in tune, and both my kids and wife said they really liked the tone of the R&R with out even knowing i was playing a new flute, i think it's very lively where the Pratten may be dark and dry?
since the Pratten is keyed, i play it the most and feel closest to it, it has wide decorated rings and John made one for my wedding ring in that style.
i want to narrow my flute collection to just one flute, and i'd be happy with a keyed Delrin flute by Gallager in any one of his models. the small holed R&R is just as loud as the other two...i think the Pratten has a biggest low D of the three? and the cork set 3-4mm further from the embouchure? so i may play around with the cork and see how it effected to bottom D? i have yet to play them side by side, and just enjoy playing them.
the delrin is totally new, and it's as good , and i really love it.