I hope you meant 'bigger' as in the bit-wise, because I far as I can tell, theyre the same size screen. But yes the quality of the (screen and buttons and, well everything, except the processor and the speed of the PIM stuff) Ipaq is less. Before you buy it, take a look at the Picture of Jason Dunn's (author of PPC thoughts) Ipaq.. it's on there somwhere
www.pocketpcthoughts.com. God, that thing is horrible. But still it's up to you. The biggest deciding factor for me was tha wiht the Casio, I didn't have to buy any expansion packs to use a CF card (which I already had a lot of, and you will most likely end up buying some). Also, with the Casio, I have a Casio outlet store in my town, which allows me to upgrade if they ever have a new version come out, well kind of. Still, the Ipaq is a good LITTLE PocketPC, it just has aolt of LITTLE problems.