There's no single answer for everyone. You have to decide what's important to you. I chose a Sony because I wanted to standardize on EPub, I liked the hardware, and I liked the touchscreen. For others, the store is the important thing, or they want a bigger screen like the DX, and then the Kindle is the way to go. There are other considerations as well -- I'm just offering examples.
As for using Doc or RTF, I'd recommend that you convert to an appropriate ebook format anyway, so this doesn't bear upon the choice of a reader.
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