Well you seem to imply in your post that the goal is to compare which consoles have the most high-selling exclusives or perhaps high-quality exclusives?
Either way the problem is that the Top-25 selling games for a console are not necessarily representative of the rest of the top selling games for that console. All you've shown is that amongst top 25 games (and top 25 games only) the 360 has more multi-platform games. This, in essence, confirms what everyone already knows, which is that multi-platform games sell better on the 360 and thus more easily penetrate its Top-25 list.
You would need a list of all high-selling games for both consoles to make the comparison you were trying to make originally. Fortunately you can achieve this by just setting a cutoff point, for instance 500k or 750k would probably do fine.
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