When Adalysis can't determine a winner ad (during the daily automated testing) because the ads in the adgroup perform similarly, it will let you know in the Recommendations section on the dashboard.  

You can either leave the ads as they are, or replace the lower performing ad with a new one in an attempt to determine a clear winner.

Clicking on the above alert will show you the list of adgroups that currently have this issue. Click on the adgroup to see the ads.