I use whatever I have in my bag and that depends on where I am going and what I'll be doing.
I love the feel of flipping through a series of photos using my hands... Sort of like an actual book not an electronic book. But it is becoming harder and harder to get film developed.
I have my iPad and camera with me all the time, and seem to be reaching more and more for my iPad to take pictures over my camera phone because with the iPad, it is just so much faster to take pictures. With my phone it can take up to five seconds to take another picture depending on the lighting and whatnot.
My digital camera I still take with me, just it was expensive so I take that out only when I would have no fear of dropping it or hurting myself.