There's a bit of apples and pears. The basic difference between the Sony and the Iriver is the Iriver keyboard. You want one or you don't. If you're going to write lots of stuff, you need it; if not, not. They're as near as whatever the same price.
The Iliad has a bigger screen, which might be good for comics, but makes it bulkier.
It's a *lot* more expensive - about twice the price or more. And out of stock, so no instant gratification.
So - bigger and expensiver (a new word every day
) or littler and cheaper.
And if littler and cheaper, keyboard or not?