Hmmmm.... It's more depend more on the person than the brand. Are you one of the people who says things like, "JD sucks and are overrated, and overpriced, and yeah Trump, tariff the heck out of them for wanting to go to Mexico to avoid way overpaying a bunch of unskilled union works, and they're an evil company who forces you to pay them to be able to work on your tractor." If that's you then don't buy JD oil. If you're going to say about it, then be about it. If you're some who says, "I went with Kubota over Deere because I preferred it, or got a better deal on it, or like the Bota dealer more than the Deere dealer, but I have no bias against either brand." Then yeah if you get a good deal on JD oil it will likely work just fine in a orange machine. Personally I look at JD engine oil the same way I look at Motorcraft engine oil. Yes, they are quality oils, but I'm not paying you Full-Synthetic oil prices, for oils that are only conventional, or semi-synthetic oils. No, I'll just stick with whatever the cheapest, quality brand, full-synthetic is on the market at the moment. Generally for me it's usually either Shell Rotella, Chevron Delo, or Mobil Delvac. These brands all make a full-synthetic version of their oil, as well as conventional and/or semi-synthetic variants, and I use their full-synthetic variants. I'm a big fan of Valvoline in my gas vehicles, but I have not seen them label a diesel oil as full-synthetic. Now, that's just my personal thing. I like full-synthetic oil, but I've known people who run the cheapest conventional oil they can get, with an orange Fram filter, and they keep up with their oil changes, and go hundred of thousands of miles in their pre-AFM 5.3L Silverado's, or 4.6L/5.4L, 2V and 3V Modular Triton F150's. I know that Valvoline is excellent oil, and Cummins highly recommends their diesel oil, even though it doesn't claim to be synthetic so I would definitely run it in my tractor if I found it cheaper than the full-synthetic oils. Even the Wal-Mart, Super-Tech diesel oil is supposed to work very well, but it's not listed as Full-Synthetic either, but it's priced nicely, and highly rated. It would work fine in your tractor. If Costco and Amazon sells diesel oil it's likely about the same oil as Super Tech. They are made by Warren Oil Company.
I will point this out. This is not me bad mouthing Kubota, to prop up Deere, but how many people do you know that do not own a Kubota, who actively seek out Kubota branded oils/fluids/coolant/greases/etc? I know people who love their Kubota machines, but no one who just wants to run their oils, and other fluids in machines that are not labeled Kubota. JD on the other hand sells oils/greases/etc that have a large following from people who do not own JD machinery. For example JD Polyurethane grease is very good, and popular. Also JD Cool-Guard II is some of the best spec'd coolant on the market for any vehicle, regardless of brand. I run it in all my vehicles, gas or diesel, truck, or sports car, etc. There are people who switch to JD Cool-Guard II for their racing applications. While I'm sure Kubota oils and fluids are very good, and do their job fine, they are expensive from what I've seen, and they don't have the following that Deere does for these types of products.