No doubt you have it figured close to the bone, bigrus. Deere is completely despised in my neck of the woods. Yet I know a guy who's had two successive 670's without any major problems over a thirty year period. No doubt back in the day Deere was lots cheaper than CAT (a situation that may be reversed now), and the fuel savings with Deere graders are significant according to what he says. And I've known a couple of dozer operators so bloody good with small angle blade machines that you didn't need a motor grader on the job. One was a CASE fanatic, the other a CAT man. Whatever, they just had the right stuff.
Nonetheless, I am compelled to quote just to stir the pot an old TL James highway superintendent who said, "There are two kinds of contractors running off brand machinery instead of CAT. Those going in business, and those going out of business."
My experience over the years confirms that analysis. But, the outcome may be somewhat dependent on whether operators are hired help, or an owner running his own stuff, such as you. My experience also confirms the latter premise.