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It is the most accessible platform for an Android phone user. Convenient.
Pro Adobe Digital Editions compatible
All eBooks for sale on Books on Google Play are Adobe Digital editions compatible. Google provides an option to download an .acsm file for all eBook purchased on their site. This .acsm file can then be imported into Adobe Digital editions where it can be read as an .epub inside of the application or transferred to any Adobe Digital Editions compliant .epub eReader, such as a Kobo.
Pro Users can upload their own DRM free .epubs or PDFs
Goolge has built in a function to allow users to upload their own eBooks. Up to 1,000 files can be stored using this function as long as each title is below 50MB.
Con Does not actually follow .css and HTML guidelines when displaying user uploaded .epubs
Upon close inspection Books on Google Play does not actually follow the normal standards when displaying user uploaded .epubs but rather has it's own secret method of how it handles the internal .css and HTML. This can result in display problems for user uploaded content.