A lot would depend on which dealer is stronger for me. Kubota's DEF issues have been continuous, not just in their machines but Taki which uses the same engine also has had issues. I am not buying that its all in the way they are being run, there clearly are some design issues. On this forum alone, there are pages of issues and the difficulty getting them fixed. If the Kubota dealer isn't one of those roadside dealers but someone that has numerous CTL's out there, with customers that are happy with what they do, that would help. Kubota's HVAC system does not get a lot praise. Pilot controls are nice if you like the pattern and you like the factory preset speed and reaction times. Less things to go wrong with them.
I am not a Deere fan, actually I cant stand running their CTL's and SSL's. I have not run their newest machines, so maybe their EH has improved, but it was terrible. The seating position in the machine causes me to continually hit my arms on the side of the cab and I can't stand the operator position in the cab. Feels like I am in a bathtub. I had never demoed a machine that I was so ready to give back. There are somethings in this comparison that I do like Deere better. Being able to switch patterns from H to ISO is important for me. The Deere bucket breakout is pretty impressive. I personally think the engine is stronger than the Kubota. Having the ability to tailor the machine to the operator with EH I think can be helpful. Of course with that, comes the complexity that goes with that ability.
Some things that are important to ask is if the dealer will keep you in a machine if yours is being repaired, at least through the warranty period. Some of the Kubota's have been down for an extended period of time. Sounds cliche, but in this case especially, the strength of the dealer really matters. If you haven't already done so, I would spend a full 8 hours or whatever the dealers will allow on a demo in each machine. They operate/feel totally different in my opinion. Work them both hard and see which one shines and then decide how the price factors into it, it may not matter if you walk away liking the Kubota.