Have you given them both a try? Only you can answer this dilemma. Some people prefer the one, and some the other, and they both have good reasons.
I feel privileged in that I didn't choose at all. I have both, and love both. I admittedly use my 600 almost exclusively, because I love all its extra features (now even on the internet I want to double click a word to see the definition...). However I turn to my 505 for comics and manga, to make use of the better contrast.
Ultimately, it's up to you.
Let us know what you decide!
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