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I like touch screen, because it offers the most flexibility for page turning. Having no fixed buttons means I use the device my way(s), rather than adapting to any manufacturer's button placement. I can tap anywhere on the edge of the screen, or I can swipe. If I switch between portrait or landscape mode, touch screen controls follow me, unlike with fixed buttons. That also helps if I'm reading while charging, because I can flip the device to keep the cord out of my way, yet there are no buttons to worry about ending up somewhere inconvenient or unfamiliar.
Touch screen also can adapt to content. For instance, if the content happens to be a list of books, headlines or blog items, you can scroll through them quickly, skipping items and such, rather than clicking or toggling up or down. Touch screen also requires less pressure and coordination than buttons and toggles, so if my hands happen to be dirty while cooking or such, I can lightly tap or swipe with a knuckle.
The drawback to touch screen is accidental page turning from time to time. That can be limited with a bezel of a good depth, so you can hold the device comfortably without touching the screen unless you mean to.
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