Thanks for all of the responses, although it doesn't seem like we have a clear winner. And, for the record, this MF is yellow, not red. It seems that Iseki makes the identical tractor for Cat as the Challenger, but there was some mix up. So the MF dealer has red ones and yellow ones, but they are otherwise the same tractor. The yellow ones are being sold as limited edition yellow tractors, but they are just MF tractors, painted yellow to be sold as Cats, and then rebranded as MF. And they are $1500 dollars cheaper (so the dealer says) than the identical red version. So if red is a primary color, and orange is watered down red, then I suppose yellow would be ok, as it is a primary color as well. But blue is my favorite color, and I grow blueberries for a living. But I used to work for Ford, and I refuse to own one, even if it is branded as New Holland. Just too much bad blood and inside knowledge....
I am leaning towards the MF for non-color reasons. For one, the hydraulics are a bit stronger on them, as opposed to the PTO being stronger on the Kubota. I have rarely had a problem with too little power from the PTO, but I always want more hydraulic power. Also, I like the way that MF puts the steering cylinder tucked up out of the way above and beyond the front axle, unlike the Kubota which is right in front of the axle, and JD, who put it behind the axle, but lower, with the fittings pointed down.