Although the Paperwhite remains the Kindle to get, the cheapest Kindle now includes an integrated light, plus an improved design that makes it more appealing.
Kindle (2019) review: Most affordable Kindle now has integrated lighting
Attention, Bookworms: All Kindle E-readers Are On Sale for October Prime Day - CNET
Kindle Paperwhite 2018 review: The e-book reader for the masses - CNET
Kindle 2019 review
Kindle Paperwhite (2015) review: The design remains the same, but the screen is sharper - CNET
Kindle Oasis 2019, long-term test: A few features short of perfection
Kindle 2019 edition: Now even more of a bargain
Kindle 2016 review: Cheapest Kindle loses weight, adds Bluetooth feature - CNET
Kindle - Wikipedia
Kindle (2019) review: a backlight can't save the low-res screen - The Verge
Kindle Oasis 2019 review: the most paper-like reader yet, Kindle