Hi,
I'm also reading both books in parallel. I passed the original SCWCD a few years ago but want to do the 1.4 version in order to learn a bit more about tags, EL, etc. I used the first version of the Study Kit for that certification and was happy with it. I wasn't really that fond of Head First
Java so I've been surprised each time I find myself impressed with HFS&J. JSP and Servlets have gotten pretty complicated (maybe too complicated) and I think HFS&J does a good job of making sure you understand the simple structure below the complexity, like why in the world you'd want to use EL. (though I still feel that everyone is trying to convince themselves that mixing html and code is far worse than it really is but that's another question). In any case I think that HFS&J really does make sense of all this, and by berating you into doing the exercises, probably does a better job of getting you to learn it. On the other hand if you already understand the logic of jsps and servlets and just want to cover all the technical details that will help you pass the
test then maybe the Study Kit is better. I know that the humorous aspect of HFS&J will just be too much for some people and a breath of fresh air for others. All in all though I like them both but HFS&J is no doubt much more humorous than the Study Kit. I'd almost go so far as to say that you ought to pick up HFS&J and look at the pictures when you're in a foul mood. They'll bring a smile to your face. I do think that makes it a little easier to pick up the book when you really don't feel like studying anything.