Firstly, I don't have a Libra 2, but, the Libra H2O. They are similar enough to give an idea. So...
The screen of the Libra H2O is better than the Aura H2O. It is partly the resolution, but, also it has a newer generation screen. From what I have seen in the shop, and based on the Sage I have (now in my wife's hands) which has the same generation screen, the Libra 2 will be a step up better than the Libra H2O.
Holding the Libra H2O one handed is easy and very comfortable. But, I didn't have an issue holding the Aura H2O one handled. I generally hold it by the wide side with my thumb near the button and my little-finger along the bottom edge. If I am lying on my side in bed, I sometime hold it by the top-right corner to give my other hand a break.
Overdrive is based on the address you have set for your account. If your address is in a country that supports Overdrive, it will be enabled on the device. And except for exact version, Kobo uses the same firmware on the device worldwide. In the past, Kobo has sometimes not released an update for Japan, or released a version just for Japan. But, this is based on the affiliate and can easily be worked around.
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