Reporting Speed	Lapse in data - Data batch processed about hourly	About real-time tracking
Customer Support	Forums	24-5, Dedicated account manager, live support, online tutorials, Omniture University
User Interface	Intuitive, easy for new users	Advanced customizable but takes some training
Instant Segmentation	Yes	no (available with purchase of Discover)
Classifications	Not available	One of the most powerful features of the solution
Security	Google owns the data	Data belongs to you
Cookies	30 days	You can set any length for conversion
Campaign Tracking	Only 4 variables	Unlimited through classifications
Mobile Analytics	Basic	Much deeper breakdowns (device, screen size etc)
Events	Conversion event - purchase	20 Custom events on top of e-commerece events
Pathing	A few limited pathing reports	22 different Pathing reports
Unique Visitor	Only daily uniques at site level	Reports available at site, category, product, and page level for day, week, month, quarter and year
Data Integration	API	API as well as pre-built integration with industry leaders, and Open Data Sources architecture for importing offline metrics
Excel Integration	Reporting	Reporting and Excel Client- allows manipulation and interaction with data in Excel
SEM Integration	Adwords synchronization	No (Search Center product at additional cost)
Dashboards	Prebuilt dashboard	Customizable unlimited dashboards with sharing and scheduled delivery
Multi-Media Tracking	No	Track video views, files, duration etc.

Google Analytics and Omniture's SiteCatalyst are both distinguished solutions for web analytics insight.  They can provide organizations business intelligence to determine return on investment and employ powerful optimization strategies.  Each solution has strengths and weaknesses.

Google has an intuitive user interface, instant segmentation, and SEM integration.  The user interface is easy to use.  New users and those that are new to analytics in general can easily begin using the platform.  It is apparent there is UI and UX expertise.  The instant segmentation provides rapid data break downs that make segmented reporting available and efficient.  Omniture customers must purchase a separate product, Discover, to attain this functionality.  

Omniture excels with customization, data classification, reporting accuracy, customer support, and integration.  Rich customization sets designed to fit any set of requirements allow SiteCatalyst to achieve superior levels of robust functionality.  Classifications allow relational data points for exponential reporting options that can be changed retroactively.  Omniture offers several methods of improving data accuracy.  Image pixels to circumvent the reliance upon JavaScript, as well as several development libraries to pass data server side.  The customer support is top notch through account managers and support reps that are all very helpful.  Integration is another point of affliction.  Data manipulation through API integration, access to raw data through Data Warehouse (additional cost), and importing data through Data sources.

Conclusion

Before making a choice of analytics packages one must look into the resources available to dedicate to the solution as well as have requirements well defined up front. The most important question to ask is, "Do I have enough resources dedicated to assessing and improving my site(s)?"  This is where money can be wasted on an underutilized resource.  An internal resource or external contractor/agency is needed for SiteCatalyst to truly be effective, ideally a dedicated web analyst. 

A blend of both reporting platforms is ideal for arming an enterprise with the insight needed to most effectively optimize.

Sources:

http://www.haiensheng.com/blog/analyzethis/2009/jan/omniture-sitecatalyst-vs-google-analytics
http://www.trendingupward.net/2008/11/omniture-google-analytics/
http://actionable-analytics.com/2009/05/google-analytics-vs-omniture-site-catalyst/
http://chasesagum.com/6-reasons-i-prefer-google-analytics-over-omniture
http://www.thesearchenginepros.com/Omniture-Vs.-Google-Analytics.html

Note* both products continually update their feature sets.  I look to ensure this is up to date.