Tomcat 3 vs Tomcat 4

[TomCat TomCat]

Hi, I am in the process of investigating to choose a servlet container for 
our project. I am wondering if we should start off with Tomcat 4.0 or Tomcat 
3.2.1. Can anybody tell me what are the major differences in Tomcat 3.x and 
Tomcat 4.x?

Thanks.

-Vik
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