I think we have a good consensus that the Indian Bosch injector nozzles are not manufactured up to the necessary standards. The new-old-stock French Bosch injector nozzles probably are manufactured to a good standard. The ones I have look like a space-age component - shiny like a mirror.
It is a bit more subjective to compare the Italian Bosio injector nozzles to the French Bosch injectors. I'm not qualified to comment because I've never seen the Bosio nozzles.
But I think you have little chance of going wrong with the French Bosch injectors if cost is not an issue - along the lines of "do it once and be done with it."
Ken300D
Disclaimer - I'm selling my excess supply of French Bosch new-old-stock nozzles. - see Parts section.