To make your choice, I recommend starting by thinking about what you want to do with your screens and what type of content you want to highlight for your target. Some digital signage companies don't offer all types of content, so that's something to check. I recently worked with system.tv on a digital signage project, and it went really well. Their system is easy to use, and their customer service has always been responsive and effective. They offer a range of solutions that might fit your needs.