Here are some loader specs for you, right off the websites of the various manufacturers:
FOR 21 to 24hp tractors, measured at the pivot point:
LA352FL1 for the Kubota
B2410 = 925 lift, 1336 breakout
LA12/112 for NH TC24,Case DX24 = 1090 lift, 1720 breakout
Kioti 120 for the Kioti CK20 = 1074 lift, 1511 breakout
The above Kioti and NH/Farmall arms are curved arms; Kubota's are straight arms.
For 30hp tractors, measured at the pivot point:
LA402 for the Kubota
B7800/
B2910 = 1060 lift, 1684 breakout
LA14/114 for NHTC29/Case DX29 = 1256 lift, 2712 breakout
Kioti 130 for the Kioti CK25/CK30 = 1155 lift, 2046 breakout
The above Kioti and NH/Farmall arms are curved arms; Kubota's are straight arm.
Does this conclusively settle the debate of CURVED versus STRAIGHT arms? I don't think so. But it does point out that at least the NH/Farmall loaders have some serious capacity, followed very closely by the Kioti arms. The Kubota set up is weak at best when compared to these other two brands. JD has specs that I have not been able to make APPLES TO APPLES comparisons for, but their lift is lighter than the NH lift while the breakout exceeds the NH lift. It leads me to conclude they are measured at different points, which also is something that must be considered. All the measurements I listed above are at ground at the pivot point. Measure at elevation and all of the capacities go down, also measure at "X" inches in front of the pivot point and the capacities go down. So I only chose to post what I know to be exact comparisons.
What I do know for FACT, being that I use both Kubota and NH tractors is, that for my money, there is no better loader than the NH loaders because they offer the best visibility of any loader out there. Having spent a week on a
B2910 with its long flat hood clearing out an industrial field, I really learned how much easier and faster it is to use the NH equipment! Being able to see what you are putting into the bucket is a HUGE time saving advantage that is very under rated. Even if the tractor & loader specs are identical, the tractor with the curved arm loaders is going to be faster & easier to use because you can SEE what you are doing. People have told me they can do just fine with "brand x" but when I put them on the 2 different machines and have them go move something they come off the NH sold on the advantages. Kioti loaders look to be nearly as good on paper (although weaker on breakout force) and nearly as good from the drivers seat. Their arms don't slope down as much as the NH/Farmall arms do. But they are mighty fine loaders.
The new JD 400X loaders, which have a curved design, are all for show. The arms actually do nothing for line of sight and still block visibility to the bucket. In fact, with the bucket on the ground, the JD 400X arms are still above the top of the hood of the JD tractors. But they sure look good. And in all fairness to JD, the 400X loader is built for a MUCH larger machine than I have been using for comparison so perphaps when they make a version for their small and medium CUTS that will be something that more favorably compares to the NH/Farmall units?