I have the original blue 3DS and a Happy Home Designer New 3DS XL, which I've been told is only available in Europe and Japan.
I used to have the N3DS XL HHD edition before but tbh I prefer the regular, I mean I don't really use amiibos much nor desire SNES game so hard anyways.
And yeah I don't know about release for that actually but seems it was only Japan and EU/AU now that I looked it up.
I made a huge jump from A to Z with my 3DS, so I don't know if I can really judge the technical side of it. The bigger screen is great to me. I like to be able to see my games as good as I can.
I have 2 2DS'S. One is red and the other is blue. I love them so much.