My company has AMKUS. We have a variety of spreading, cutting, and jacking tools and pumps from nearly new to antique (reserve-LUKAS with AMKUS label---It's the antique). We have been pleased with the performance, weight, balance, and ease of operation. Our rescue techs have had classes where use of multiple brands is required for completion and they like the AMKUS better. I suppose they are pre-biased because that's what we own. We did research and tests when we bought the first new stuff about 15 years ago so that infomation is no longer valid...There were only three major Americian brands then, Hurst, Homatro, & Amkus (At least that's all the ones worth looking at at the time that were marketed in our area). We have been pleased and they have worked well for us.
Both then, and now, I have learned that numbers are not everything. Where on the arm or blade was the measurement taken, at what angle, how far open/closed, and from what angle are all marketing tricks that can be used to make a tool appear more powerful. Bottom line does it work for you and do the job you need/expect. Then there is the question of newer and more "powerful" equipment becoming available. And don't forget, for many of us, "can we afford to buy something new?"
We are looking into what "super cutter" we can purchase that will work with our AMKUS pumps (pressure and oil) and what pump will best run some of the new more "powerful" cutters. The first and second generation cutters are not sufficient to cut some of the new harder metals being used in some cars and guide rail I-beams.
Be Safe and Get The Job Done.