I haven't kept up with the latest pricing, but when I was tractor shopping for 2 years solid back in 05-07 I compared about every model of every make in the 30-45 PTO horsepower range. And I got quotes from at least 2 dealers on each.
Comparing nearly identical tractors, the NH was the most expensive, Kubota was 2nd, Deere was cheapest (again, comparing dealer prices for nearly identical tractors out the door). But there were certain features or model combinations that were only available from one manufacturer. For example, if I wanted a Powershift transmission, Kubota was the only one to offer that in the L series. For base model tractors, Kubota's L3400 and L4400 didn't have any direct comparison (maybe to the JD 990... but not exactly). For a small utility, Kubota was the only one that offered Power Reverser on a 'value' tractor with the M5040. Deere had more basic 5x05 (no reverser) or the uplevel 5x25 series, which were cheaper and much more expensive than the M5040 respectively (but with feature content that matched the price).
But there were special deals that would come along that could knock any of the 3 into the value lead. When the L40's replaced the L30's, Kubota has some excellent prices on old stock L30's. I ended up buying NH when they offered several thousand off and 2.9% for 96 months on the TC55 when they were phasing it out.
So you can say based on a special sale, or having a model available with the exact feature content you want that one brand is a better value than the others, but if the tractors are comparable and no one is running a land rush deal they were all within $1000 of each other out the door. I also found the non-big name tractors to be so close to the big three in price that I wasn't willing to take a risk on them. I'd rather spend the extra $2k-$3k up front and know I'm getting a unit with dealer support and resale that will be there decades down the road.