Krypton and argon are both used in between the lites of glass in Low E and High Performance glass products. Both are inert gases that are not harmful to humans. Both have higher density than air.
Krypton is a better insulator because it's more than twice as dense as argon. Here is an easy analogy for you:
If you were looking at a swimming pool and it was empty, you could hop in and walk the full length of it quite easily. That's what air between the panes of glass is like. If the pool had water in it you would take longer and spend quite a bit more energy walking from one end to the other. That would be like argon. Now let's fill that pool with Jello, Jello symbolizing krypton gas.
I'm sure you get the drift. Krypton is a far better insulator than argon simply because of its density. Here is some more from Efficient Windows.Org if you're more of a technical person.
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