I have both Kubota and Deere...
I lean more towards Kubota all things being equal.
Can honestly say I have not had a warranty claim with either new Kubota...
The Dealer proximity and attitude is a factor... but, not as much as I first thought.
Both of the local Kubota Dealers folded up shop... it really came as a surprise.
Since you have both, are the JD's built as stout as the Kubs ?