I asked published authors about their favorite e-readers - and the Kindle isn't the only pick

Perhaps the most popular e-reader on the market today is Amazon's Kindle, thanks to its easy-to-use interface and the widest selection of books in its library. 

Sandra Beckwith, an author of six books who also teaches other authors how to market their books, said she uses Kindle as her e-reader. 

"I use a Kindle because I buy e-books on Amazon, which delivers them automatically to my device," she said. "The process is quick and easy -- I love a good easy button."

Review: One of the best E Ink readers I've tested isn't made by Boox or Kobo

The Kindle Paperwhite is our pick for the best Kindle you can buy, since it has a large 7-inch display (the previous generation was 6.8 inches) and is thinner, making it even more comfortable to hold while reading for hours. It has all the familiar features of a Kindle (300 ppi e-ink screen, long battery life, and adjustable warm light) as well as a waterproof design so you can read by the pool this summer. 

A newer Kindle option is the Kindle Colorsoft, which is a color e-reader with a 150 ppi display for color images, along with up to 120 nits of brightness to really make your pages and color images pop. 

Jason Rich, an author of over 70 books, including Optimize Your Daily Routine as a Busy Entrepreneur, said he 
is a fan of the Colorsoft's color and glare-free display when he reads for pleasure. 

"Unlike a traditional phone or tablet screen, the Kindle causes no eyestrain. Having tried out many of the eReaders on the market, I found this one to be the most versatile and enjoyable to read on," he said, adding, "As an author, I appreciate being able to see content from books the way the author and publisher intended, so a color screen is preferable to me."

Review: Kindle Colorsoft: One of the best E Ink tablets I've tested

The Colorsoft's color features also let you highlight passages in your books in different colors and organize them into categories (i.e., quotes in yellow, facts in blue, characters to remember in purple, etc.). 

The ReMarkable Paper Pro is part e-reader, part note-taker, for those who like to multitask and be productive. 

Rich said he also uses the ReMarkable Paper Pro for work-related reading, note-taking, and editing. 

"I like the note-taking and annotation tools better than what the Kindle Scribe Colorsoft offers," he said, adding, "The larger display nicely replicates a full-size notepad or the full page of a printed publication. I often use it to edit manuscripts and annotate PDF files." 

Review: ReMarkable Paper Pro

The writing experience, in particular, makes the ReMarkable Paper Pro stand out to authors. There is zero lag between the motion of your hand and the line you're drawing on the device's screen, resulting in a realistic, enjoyable writing experience.

While iPads are not classified as e-readers since they don't have that traditional E-Ink screen, many people still prefer to use their iPad as a reading device, since you can download any type of book-buying/lending app. 

Dr. Gillian Goddard, a board-certified endocrinologist and author of The Hormone Loop, said she uses an iPad Mini for her daily reading. 

"I like that I can use it to reach several different platforms, including the Kindle App, iBooks, and Libby. It's small, lightweight, and interfaces seamlessly with my laptop and phone," she said. 

Review: Apple iPad Mini (7th generation)

The iPad Mini has an 8.3-inch Liquid Retina display with 326 ppi, which is higher than a Kindle's resolution. As a result, text looks especially sharp on screen, and Apple's True Tone technology (which adjusts the color and intensity of your display to match the ambient light) ensures you have a natural reading experience, whether reading a book or an article on the web.