In this article last week I have compared WebLogic and WebSphere support for the latest JEE6 standard (which WebLogic does not yet support). However I am often asked if there any other standards and APIs that are different between these two application servers. One might look at the market share reports where WAS and WLS are within a few percentage points of each other and assume that there are no big differences between these two products.
Read my full article here: Standards support and programming model extensions in WebSphere and WebLogic.