I live in an extremely rural area. The Deere integrations are a huge reason.
Another that's not talked about is Deere field service. It's just DAMN GOOD. If you're running a serious tractor(7-9 series ) and it's the middle of planting/harvest hours can be the difference between red and black margins. Deere will roll out a team with 30ft trailer of parts out in hours if you have an issue. CaseIH will sorta match this, kubota and New Holand will simply not.