Two different companies' opinions on how to build an ultra small/ultra thin camera.
http://www.dpreview.com/reviews/compare_post.asp?method=sidebyside&cameras=canon_sd400%2Ccasio_exz55&show=all
Much like the difference between a Chevrolet, Dodge, and Ford subcompact.
Which is better?
Auto sales say, they are all three better to someone.
...
..
.
What is the real difference between the Ex series and the SD series?
Thanks.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic