As mxz900 stated, they are the exact same track and pattern except the 33 has clips in every window. I just tossed this same dilema around for about two weeks and decided to go with the 9833. It's 2.7lbs heavier and $50 more, but I'm just not totally sold on the idea of the every 3rd window closed concept.
What really put me over the edge was when I saw that ski-doo is going back to the open window tracks. Each of the new revs I saw this fall had open window tracks on them!
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