Even though the OP made a choice, I voted for the Aura because of its great form factor, its weight and the ability to fine tune the light with two fingers.
If the question wasn't be have one and only one device, I would go with the Mini and the Aura HD (as I do, actually).
Quote:
Originally Posted by RobertJSawyer
(Sadly, the Kobo Mini turned out to be their worst-selling device in the 2013 line-up; it's too bad, because it filled another underexploited niche -- of major players, only Sony had also offered a 5-inch E Ink device -- and I think the Mini is fabulous; I have two of them. The Kobo Mini has been discontinued.)
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This is sad news indeed. However I believe that one has to actually use a Mini to realize how great an ereader it is. So it's really only after the purchase that the Mini shines
The 6" size being so mainstream, another size can be a put off to first time buyers.

my Mini