Now I have done a lot of work with SMART boards but was unaware that there were other types of interactive whiteboards. What types do you use in your classroom?
Here is some research I made comparing Promethean and SMART boards:

The SMART board and the Promethean board are similar in the fact that they serve the same purpose in the classroom. They create interactive lessons to help enhance student learning. These boards do a great job of engaging the student learning and helping get hands on learning. These boards can be used for things like creating lessons in advance that can be saved for the future, you can diagram activities, teach steps to a math problem, students can easily share interesting projects for parent/teacher/student conferences, it can help ESL learners and special education students using charts and graphs, as well as fun electronic word walls. There are templates and plenty of websites dedicated to helping create lessons that use the advantages of interactive whiteboards. They may seem similar but there are also differences to each of the different interactive options. One of the main differences is that the smart board is a "soft board" that you can use your fingers to draw on. The Promethean ActivBoard is a "hard board" that requires the use of a special pen. Promethean software is more "child-friendly" with their fancy colors and animation, but the SMART Notebook software is more flexible in that you start with a blank page. Now a main factor in deciding the choice of interactive whiteboards is also the price. School districts are getting less and less funding each year so they have to be fiscally responsible. The Promeathean Activboard can be found for around $1,700. The SMART board can be found to run around $2,000. This means that the Promeathean board can save you around $300 per classroom, which can become quite a large amount. The SMART board technical specifications include things like multi-touch finger and pen based solution. It can have multiuser modular pen tray with four-color buttons and the SMART notebook software. They have a variety of different makes and models so you can see what may work for you. Many even come compatible with whiteboard markers. They also need a projector that comes with the smart board to operate. They also have an extended control panel. Overall, the SMART board has a lot of different upgrades and specifications that can be used in any classroom. The Promethean board comes with a variety of options and technical specifications. Cordless Battery-free pen incorporating tip switch and side switch for full mouse functionality. Available as Fixed System, Adjustable System or Mobile System complete with choice of stands and Short Throw and Extreme Short Throw projectors. The future of interactive whiteboard teaching and learning is not about “replacing” pens with “touch” but rather developing a new “multi-touch” interface that allows users to customize their interactive experience. It can accommodate multiple users collaborating on a single task – an essential student skill for the future. Images can be easily moved, scaled and rotated with finger touch with real life “pen” tasks such as writing and drawing across the whole surface, which can increase engagement. Promethean boards are also compatible with Mac, or PC operating systems so it can be easily integrated into the classroom. It can be easily adaptable and can be great for working with students.