If you expand the list over enough headings, you'll eventually come to the conclusion the 135 was the greatest ever made imo.
Firstly, it was the probably the best tractor of its era. Best selling tractor that ever was. There's plenty of them still going, which is testament to the fact that even though their era has passed, they are still capable of doing a bit of work. They were very capable for the power output. Ultra Reliable, better power to weight ratio and engines than Ford and Nuffield offerings, bomb proof hydraulics unlike IH. Better quality materials were used in the panels and water hoses than Zetor. Less issues with brakes than the larger 100 series models, (dry braked ones that is)
Where they shone over a 35 was the direct injection head. Easier started on a frosty morning, back in the days when servicing and maintenance weren't top priority. Ran a bit sweeter, few horsepower more, and the dual clutch too, although many 35x were live drive.
You'll always hear of lads had bad experiences with most other tractors. Ford's with porous blocks, IH with hydraulic issues etc. I've yet to hear of anyone to ever say they had a bad 135