I'm assuming you mean to compare the popularity of Apache
Tomcat and BEA Weblogic? You may be able to get some broad statistics from a site such as ServerWatch, but depending on how those sites chose one over the other you may be comparing apples and oranges.
For example several place I have worked refused to consider Tomcat as they required a support agreement. They have also been IBM/Sun/Oracle/other 'shops' where they preferred a particular vendor. Sometimes they selected the product based in the ability to integrate with other servers or because the included a particular package or feature.
Unfortunately, once you take these into consideration there is no clear 'better'