I think durability often depends on the user and his/her habits and handling and environment. I don't think anyone has an edge there.
I chose the eInk screen on the Kindle 3 because I don't use it for anything but text.
There is a video showing disassembly of the Kindle 3 which gives you access to changing the battery. Whether or not you can FIND a battery to replace it with is a question. LiION batteries have gotten much better and most will last many years with minimal degradation. I have some I've use in my cameras that date back to 2006.
A lot depends on where you plan to obtain your reading material. Amazon is a strong argument for the Kindle but they don't carry everything. You can buy elsewhere and convert if you want to go through the hassle and don't collect massive libraries.
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