Why do anyone needs tiles if same effect could be achieved with simple custom tags with "fragment" attribute?
Tags even have several advantages over tiles:
Only result pages are ".jspx". Includes are ".tagx" files so you distinguish clearly pages and includes. Nobody wants to include the whole page into another in real project.
You need less libraries
All IDEs have JSP support but not all of them supports tiles. Idea has no such support (except buggy outdated plugin which does nothing actually).
Why do you choose tiles? How does it help you?