I responded to your comment, not Vince.
There is a huge disparity in the "World" tractor market versus the "US" market. I've traveled enough to see that disparity first hand. But I'll restrict my thoughts to the US since it's my homeland.
#1. John Deere. Reliability. Technological Advancement. Broad product line. Huge support network.
#2. New Holland. Reliability. Broad product line. Excellent parts availability. Good dealership network.
#3. Case/IH. Reliability. Broad product line. Excellent parts availability. Good dealership network. Under NH only because of numbers in my area. I can't speak for all of the US.
#4. Kubota. Reliability. Widening product line. Excellent parts availability. Very good dealership network. Accessible manufacturer support. Under NH and Case/IH only because of limited product line. That is changing yearly and remains to be seen if they can compete in the AG market. They have already moved into the <200HP market especially in the area of Cattle Ranching, Hay Production. Don't see them much in the row crop market yet.
#5. Massey Ferguson. Reliability. Broad product line. Good parts availability but somewhat limited. Satisfactory dealership network. Under Kubota because of limited product line under 100HP. Excellent world market for their size domestically.