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All three of those devices use an e-ink screen with a slightly matte finish. As far as being anti-glare, they should all behave the same. The Libra 2 has a noticeably better contrast of black vs. the previous generation devices, to my eyes, at least. Some people do not really perceive this difference as a big deal, but I've never heard anyone compare the Libra 2 screen unfavorably to any reader other than the old Kindle Voyage.
I do not like the way the Libra 2 has implemented the upraised ridge on the button side. It's does make it easy for your thumb to hold the device one handed on that edge, but it also create a hard plasctic pressure point I'm not fond of.
They all have the save dictionaries,, but no thesaurus, (that I know of, unless you mean the Wikipeida or Google searches.)
I think the Libra 2 is the best e-reader I've ever had my hands on, as long as you are not bothered by Kobo's overall software quality issues.
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