Double vs. Triple-pane Windows

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Hi:
I live in Lansing, Mich., and had two local window companies out to quote a picture window replacement. The first pitched a triple-pane with Krypton gas. The second told me triple-panes are not worth the investment. There brand (Northstar) is a double-pane with Argon gas.

Also, the first company uses a foam insulator along with a series of chambers in the frame while the Northstar windows just has the series of chambers. Is one better than the other?

Any advice will be appreciated!