What are counted when measuring telescope productivity? How many occurrences of #1 have there been for the Very Large Telescope? How many occurrences of #1 have there been for the Hubble Telescope? Is #2 greater than #3?
Very Large Telescope
Telescope productivity is measured based on how many scientific papers a telescope generates. The Hubble Space Telescope is the most productive telescope in the world. 
telescope in the Atacama Desert, Chile
Is the Very Large Telescope the most productive telescope in the world?