Auto tagging v/s manual tagging
Re: Auto tagging v/s manual tagging
Manual tagging means more effort on your part. Auto-tagging relies on a click id (gclid) which ties the clicker to the ad.
Google Analytics can share data with AdWords, and you can have the greatest information set at your disposal, in Analytics.
On the other hand, if you do not use Google Analytics, auto-tagging is meaningless, because Omniture or Coremetrics or Piwik cannot query Google AdWords for "inside data". If you use third-party Analytics packages, you need to read their documentation and tag your destination URLs in a way that the Analytics package understands.
In both situations, you need to test that your website allows for parameters in URLs and test your destination URLs before launching the ads. There were occasions when a ?gclid=1234 or &gclid=1234, appended to a URL, caused an error and nothing was tracked.
Quick word of advice (and Google Analytics plug): if you're not forced to use something else, dive into Analytics linked with AdWords and auto-tagging and you'll be very pleasantly surprised.
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