A phone is easier to carry continuously, while a tablet can make reading, video and some document work more comfortable. The operating-system generation does not remove those physical differences. If your main need is calls, navigation and quick replies, a phone may remain the right tool. If you regularly annotate documents or follow lessons, a tablet can add useful space, provided the applications support the work.
For a tablet, check keyboard and stylus compatibility by exact model. The presence of Android does not mean every accessory works in the same way. Confirm whether the pen is supplied, whether it needs charging and which functions the intended app supports. Also test the learning platform or work service in the browser and app. A mobile version can differ from the desktop experience you already know.