This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
That is not a particularly useful generalization. IMHO you should think in terms of using servlets for computation intensive applications and JSP for supporting complicated HTML designs. If you are the only Java programmer in a shop that does a lot of HTML, custom taglibs in JSP make sense. Bill