This is a personal preference. But in terms of complexty SCBCD is harder than SCWCD. And also in a natural flow of the technologies Servlets and JSP preceeds EJB. A solid foundation in JSP/Servlets really helps in understanding the rationale and usage of Business components in terms of EJBs and also you can develop an enterprise application without EJBs but not without Servlets and JSP. So choice is yours, if you already have invested sometime in learning EJBs then continue with that otherwise think of SCWCD. However, there are no dependencies in these two certifications except JCP which you already have done.
Personally I'm finding SCWCD more difficult than SCBCD. Maybe it's because I'm studying for the new version (JSP 2.0, Servlet 2.4...with JSTL, patterns and the like); but I can assure you that I'm finding this exam (especially the EL and Custom tag part...not JSTL as I'm using it at work everyday ) WAY more difficult than EJBs (which I also use at work daily). Unfortunately we're still using JBoss 3.2 (with Tomcat 4), with Servlet 2.3 and JSP 1.2, and EL and the new tag facilities are not part of our daily work. We'll have to change a lot in the way we build web apps from JSP 2.0, and I've already prepared my manager [ October 27, 2004: Message edited by: Marco Tedone ]