What is the advantage of krypton flash light bulbs Vs. regular halogen Vs. LED when buying a flashlight?

I know that LED flashlights are pretty crappy. I heard that Krypton flashlights and Halogen flashlights are about the same and produce the same intensity and range. Is this true? Does anybody have first hand experience?
Update: I know that LED is great as far as battery life but does not have as much candlepower as Halogen or Krypton.

Between Krypton and Halogen, Which has more candlepower?
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