Those are some pretty cheap devices...didn't realize the Kindle had gotten that low. I have an original Kindle Fire, and I've been pretty happy with it, although at 7" and limited word processing, it hasn't been everything.
The little laptop in your list I went on Amazon and looked at it and it is 7" too...sort of like a mini-iPad with a keyboard, except that it's really an Android tablet with a keyboard! A tablet that size with a keyboard might just be the smallest practical tool.