FoxDen tended to work slightly better for very small video conferences. The audio was typically reliable, so it would be ok to use for audio conferencing. It is definitely not ready for prime time: it cannot handle very large conferences. It didn't seem ready to be used on mobile either. I also think it's better suited for a smaller company.
Microsoft Teams Rooms has been pretty effective for our business. It has allowed multiple members of our team to connect remotely and stay on the same page with any changes, etc. A few times, the screen sharing option didn't work great, but otherwise, the product has been beneficial.
Camera view selection is a nice feature which allows remote users to choose the camera feedback to select for better experience.
Live reactions like hand claps, thumbs up, raised hands,etc can be used to indicate to presenters that a meeting attendee has a question. This is cool.
We can connect our laptop seamlessly to the Microsoft Teams Rooms to share our content or presentation which makes things very simple.
Horrible video quality. It basically never worked, and we stopped using the video feature.
Buggy behavior all the time. Dropped calls, loss of screen sharing, rendered unusable most of the time.
Poor response by the vendor to issues. The answer was basically "we know it's unusable, and we're trying to figure that out. There's nothing we can do right now."
Microsoft Teams Rooms really 'cleans up' the old clunky way to deliver a meeting. Too often we've seen issues with scheduling and staff not confident to use the equipment in front of an audience. Microsoft Teams Rooms has provided all the tools our staff need and didn't know that they needed and provides them in one familiar solution.
I believe they selected FoxDen because we use ReadyTalk for voice conferencing and FoxDen represented a cost savings compared to our previous Skype for Business investment. However, in the end, most of our company has abandoned ever using FoxDen and, instead, still uses all of the products listed above (Skype for Business, Google Hangouts, Slack) or just plain ReadyTalk voice conferencing.
Microsoft Teams Rooms has been more cost effective for us than using a separate subscription from another vendor. With our microsoft 365 tenant already in-place we've streamlined our configuration and licensing into a single management portal which really suites us and the way in which we work as an organization. Managing meetings is just so much better through Microsoft Teams Rooms than any of our experiences with other vendors.