Chromebooks and the Chrome OS are constantly improving and offering more features to more students and teachers. An example of this is found when you consider that earlier this summer Google started supporting the use of some Android apps on some Chromebooks. Initially, the list of supported Chromebooks was small. That list has steadily grown over the last few weeks. You can see the list on the Chromium Projects website. Likewise, the list of Android apps that can be used on a Chromebook as steadily expanded. That list can be seen on this Chrome Web Store page (note, the page only displays the apps if you are viewing it on a Chromebook).
Jim Mendenhall has created a great webpage for comparing the features of various Chromebooks to help you find the best one for you and your students. Jim also recently published a video about how to use Android apps on Chromebooks. That video is embedded below.