I've had both Oasis 2 and Libra H2O, but I didn't use KOReader with either. The display wasn't particularly good on either, but the Libra had the warm light feature at least, which the Oasis 2 didn't have. Ergonomically I also preferred the Libra, I hated the metal back of the Oasis. Both were relatively bug-free and stable. The only advantage of the Oasis 2 was its speed, it was faster than the Libra.
I had no complaints about battery with either, but I think the Libra had a bit better battery life.
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