Having recently done both Bosio`s and Indian Bosch ill pass along what i experienced.On my car which was running poorly and nailing badly on one injector,i first swapped that injector into another cylinder to be sure it was actually an injector problem.I then pop tested them and the bad one was just squirting,no spray pattern or atomization,the other 4 were decent and probably would have responded to a good cleaning.
I chose Bosio nozzles to replace with as there seems to be good results with them in VWs (see TDIclub.com) ,i pop tested them before i ran them and they were all just very slightly above the hi side of the spec but very consistent.The first few days there was a bit more combustion rattle than i would like but they soon quieted down and the car runs very well,starts instantly and no visible smoke in the daytime unless i really floor it from a standing start.
My sons car (both300d 2.5s his 93 mine 91) i did not hear run before we did the nozzle change but he said he also had one knocking pretty loud,loud enough that he was concerned about the possibility of an internal engine problem.We pop tested his and found one very poor the others probably ok.He ordered Bosch and of course ended up with the India made Bosch.We assembled them and pop tested them and found them all well above spec and one was way off.We of course did not have the shims to correct them.I dont remember the numbers but he felt they were too far off spec to run them so took them to a Bosch shop to have them set.when installed in the car they ran quieter than the Bosios did when first put in.His car runs good does not smoke seems to have good power.
I guess in a few years we may be able to tell which set held up better,but for now my thought on the subject is that the Bosios were more consistent which one would think points to better manufacturing quality control. My $.02 Don

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97 E300D 157000 miles
87 300TD ?141k? miles