And as Adam noted today in another thread, GA will tell you how many of your visits are coming from mobile devices including browser type, screen resolution, etc. Also, Marketo doesn't really track everything. it's much more difficult if not impossible to get KPIs for any timeframe from Marketo than GA - especially now that Marketo automatically deletes web page visits from the activity history after 90 days.
Some of the KPIs we get from GA include:
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Website Visits
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% New Visitor
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Pageviews
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Average Visit Duration
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Bounce Rate
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Traffic Sources (paid search, organic search, referrals, campaigns)
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Social Value
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Keywords