Ok, this is the Yanmar forum so I'll say what I think.
I bought a neglected Yanmar in 2003 and soon had it running like new after doing all the 100 hour, 500 hour etc maintenance as one project. This brought it right up to good as new. (Operationally, not appearance!)
Meanwhile I was reading posts over in the Chinese tractor forum and realized those new owners were putting more work into, and finding more problems on, their NEW tractors than I encountered on mine - which apparently was in occasional use with no maintenance for 10-20 years. All the lugnuts were sloppy loose, one brake was stuck disengaged, headlights were bashed in, etc. After I got the proper parts on it and got it set up it hasn't needed a thing since. All the problems were user neglect, not design or early-wearout problems.
The owners of NEW Chinese tractors were fighting all sorts of design and quality problems. An o-ring in the power steering was designed wrong and soon got pinched, and crushed. Replacements failed likewise. Forever.
Instrument panels were flaky. Dead fuel gauges, tachs, grounded printed circuit boards, etc.
Bad quick disconnects causing blown hydraulic pumps. Or sheared hydraulic pump gears, or keys, for no clear reason. Repeatedly.
One ethical dealer reported he had 65 hours setup time in his Chinese tractors. Then eventually he quit selling them - the warranty work was killing him.
An owner of one of the larger Chinese tractors recently reported he chewed up the front end gears in under 400 hours, apparently due to bogus quality steel in the gears. (He saw excessive wear in the remaining gears). I've never heard of a Yanmar doing this.
I'll bet on the Yanmar to be more trouble free. I think it is a day/night quality comparison.