If I was running big equipment, say 150HP and over tractors, and related equipment such as combines, I'd say that JD was the best. I say that because of the resale value, parts, and the JD service. There are a lot of big grain farms here, and JD is the most popular, followed by Case-IH. In the mid HP category, say 50 to a 100+, most brands are pretty much similar, and I prefer NH. The under 50HP is very competitive, and as someone else has posted, a lot are made by the same company, and sold under different brands. I'm probably lucky in that where I live there are many dealers around, and parts are easy to get, at least in what I run. I have bought a few parts via the internet, and so far have been pretty well pleased. But, if you have a breakdown today, and need a part ASAP, it's very nice to know that your local dealer either has that part in stock, or will have it the next day. That's not always possible with some brands.