Small notice: pMetrics is back from few day's break. Finally, I can see it's simple interface again.
If you don't have it yet, and wonder why you might ever need it, check out my post: Performancing Metrics VS Google Analytics

I haven't check out Performancing Metrics for a long time, and when I check it out today I was shocked by the table, Google Analytics looks like crap.

The table is for purely marketing purpose, basically Metrics just find all of its unique features and stuff on that table.
So I have to make a comparison between the two myself. check my screencast or the pros and cons list below:

Metrics
Pros

• Simple graphs
• Live stat
• User action in detail
• Referrals in detail
• Real time Spy View

Cons

• No content analysis

Google Analytics
Pros

• Set gals and observe goal conversion
• Content analysis, adword analysis
• Rich presentation
• Export data into different format
• Executive, Marketer and Webmaster Overview

Cons

• Slow learning curve
• Slow javascript loading speed

Conclusion:
Google Analytics are for serious websites that have a clear marketing goal with few good professionals(Executive, Marketer and Webmaster).But it is just too slow for most people(after using analytics for 6 months, I still need 10 second to find "Referring Source" link, and watch yesterday's stat slowly show up though the flash...you know I don't like flash)
Metrics is a fast and good choice for most websites that only requires to know the most important part of
visitor's info--who(IP), where(referral, Geo location), when(time), what(user actions) and sometimes why(user search in google)

I'm going to check Metrics more often because it have just become my primary analytic system
BTW:
Metrics is the rebranded version of Clicky
Google analytics is the renamed version of Urchin