I only got to use the Epson for a short time, but it was certainly a great tool. Being a projector it was able to cover a very large surface area. It uses a standard whiteboard, and the newer versions can be used without any special pens.
Here is a video I made of me using he jTouch board with a chromebook:
When moving away from SMART, it also meant moving away form SMART Notebook. This actually has proven to be the harder task. While I can get the SMART Notebook separately now, and they will work with both interactive setups above, it doesn't work with a Chromebook. So in my research I have come up with 2 tools that I thought were very well built and were necessarily to show teachers when introducing them to the new interactive hardware.
Web Paint. This is a chrome extension that will allow the user to annotate over any webpage. It works with touch and is quite intuitive.
The next one took me a little longer to find, and that was an actual whiteboard. There are a lot of them out there, but none that really stood out. https://app.ziteboard.com/ was the first one that I felt was clean, collaborative and ready to use out of the box.
Here is a quick video I made of Ziteboard: