Try both, frequently. See which one you like better subjectively. Can you see that the Sony screen is "even better" (so you're told)? If not, does it matter?
If you're selling (rather than returning), then the Sony probably has better resale value. On the other hand, if you like the Sony better then that's the one to keep.
Since they both use Epub, you could even load up the same book and keep switching between readers on it (now that Kobo finally has "Go to Page" functionality).
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