We are currently evaluating Tomcat.

IBM WebSphere Application Server is the best in terms of scalability and performance, as well as the support for managing distributed transactions. There are other solutions on the market, such as WebLogic, that offer great experience but it usually depends on the requirements of the companies.

No

I evaluated Red Hat JBoss EAP, but since we need to integrate with IBM MQ and the IBM Integration Bus, all in a mixed Windows/AIX environment, we found that IBM WAS was the winner.

We have evaluated other products, like BEA WebLogic and JBoss.