Overall pretty good information, but many of the Kubotas have position control except in the BX and some B Series tractors.
Are you sure that model for model John Deeres are heavier than Kubota or just certain models? Weight is not important to me as I can add that, harder to take it away.
As to the twin pedals, we have a John Deere as well as Kubota and we prefer the HST controls on the Kubota, so I am not sure this twin pedal arrangement would be seen as an advantage over the Kubota. Perhaps I misinterpreted your post though and apologize if I did.
Good point on quick attach loaders, but aren't the ones on John Deere proprietary while Kubota will take SSQA implements? Not sure, just asking.
I also seem to remember some John Deeres do not have a quick attach FEL or for some this is an option?
Overall though I agree both make excellent tractors and it just depends on which fits you best.