Back in the day, when resolution was markedly worse and screens weren't lit, the received wisdom was that black bezels were best, because the contrast made the background look whiter and the text to pop more. Now, it seems to me, logic would say you might as well have a white bezel that blends more or less with the background and lets you push out the margins, mimicking "real pages". I find the latter persuasive myself, but the only white bezel I own is the Kobo Mini, which of course is the exact opposite -- poor resolution and no light.
In fact, I don't really care. The only time I did care was with two Sony X50s, where they had the shiny silver bezels. In those two cases I broke my rule and bought a skin* for the surround, because the reflection was offputting.
*I don't get spending money on skins. They're just a distraction. And they're insanely expensive!
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