This is definitely the main point in this "debate"; some people will just prefer one screen type over the other. A lot of people seem to be advertising these opinions as objective fact, and that's quite a dangerous trend.

I'm personally of the opinion that e-Ink is what I'd prefer for reading, but I absolutely despise reading on screens; anything lengthy I print out. And while I think that e-Ink is better for reading, that's all that e-Ink devices (while being a lot cheaper than the iPad) do. If you read less and do other things more, then e-Ink is unlikely to even be an option for you unless you feel like shelling out for another device for the few times you do read at length.