When choosing resources for a school library, the main focus must be on the users. Who are they? Where are they coming from? What do they have access to? What can they confidently use?
In my setting, we cater to the needs of staff and students. The students are in years 7-12, have varied reading habits, study a range of subjects, have different reading abilities, cognitive abilities, interests and, supports (physical, intellectual, emotional) at home. The teachers run the gamut from technophobe to technophile and rely on the school library for curriculum resources, teaching and learning resources, and personal reading recommendations.
If the goal is to keep a level playing field where all can access the resources provided by the library, the above needs to be taken into account.
Our budget, like many school libraries, is limited. Ebook subscriptions and databases have to be chosen with the biggest possible bang for our buck. This is something that is difficult to manage with so many different platforms that all provide different content. As highlighted in Gray (2017), choosing one of many options can leave libraries without desired titles and the shift from one subscriber to another means the loss of what you currently have- and possibly a shift to a different operating system.
My personal attitude is that it is currently better to help staff and students to access quality information through a well-designed and maintained online library presence, including support to access digital resources through local library portals.
References
Gray, M. (2017). Ebooks: To subscribe or not to subscribe? SCIS Connections (101), https://www.scisdata.com/connections/issue-101/ebooks-to-subscribe-or-not-to-subscribe