IMHO the advantage of Knipex and similar products from Weidmuller and other suppliers is the ability to set an exact and consistent wire stripping length.
Extremely useful when preparing wires for male/female crimp pins for DB, Molex, AMP, Tyco etc..
Have made thousands of crimp connections over many years using this style tool.
Beats the Klein and other similar products hands down.
Just be sure to purchase the correct pin crimping tool and you are good to go.