So are your pupils are already familiar with using Microsoft Word? Then why not consider using Microsoft Word Online available to all Glow users in Scottish schools as part of Microsoft Office 365.
OneNote is a free tool which works online through a web browser, or through apps for mobile devices, or as a desktop software (it’s also part of Microsoft Office 2013). And it’s available to users of Microsoft Office 365 (so all Scottish school pupils and staff with Glow access have this as part of the features available automatically to them via their Glow login).