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The light is far better (more even and highly adjustable) on the built in readers like the Paperwhite & latest Kobos, but there are still some people who prefer not to have the built in light, and it does add an extra layer and therefore has a very slight impact on the screen. Personally, I think the positives of the built in light far outweigh the downsides and I don't think I would go back to a non-lighted reader.
However, if you like the way the Sony deals with collections, none of the others match it in that respect. So if that is a big issue, you'll need to decide which is the more important feature of the two?
You can do things to try and improve the collections on the Paperwhite, and with both the Kobo and the Paperwhite (and Sony too for that matter) you can use plugboards in Calibre to add the series title and/or number to your book title to make them easier to sort and locate, but especially for a low-tech user, nothing will beat the simplicity of the Sony and tags to automatically create and sort the books in collections.
Personally, I found the Sony creates too many collections because of this, and now on my Paperwhite I've stopped using them altogether and just sort my books alphabetically by author to make it easy to find the ones I want to read.
The Kindle is probably the easiest for a low tech user, once it is set up and connected to your Amazon account, it is very easy to buy books and get them sent direct to the Kindle. And you can even do things like email books not bought from Amazon to your Kindle email address and load them that way.
Although one point in favour of the Sony here too in that if you are in the USA and your mother-in-law is likely to borrow library books, this is easiest on the Sony.
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