What are some alternatives?
When comparing Google Play Books and Amazon Kindle, you can also consider the following products
FBReader - FBReader is an e-book reader for various platforms. Features:
calibre - Ebook manager, viewer & converter
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
Project Gutenberg - Project Gutenberg offers free ebooks to download.
The new iPad Pro - 10.5 inch - Thinner and better
Kobo Books - Kobo Books is a best in the class eBooks and eReadering apps for many reasons.