I would say Bridge mode for this just to prioritize performance and
reduce latency for this TV/sharing use-case. That being said, there are
far better ways to handle this type of hospitality use-case.
Why 100 VLANs? Why should they all be in the same broadcast domain?This
question is impossible to answer without more details. Bridge mode or
tunnel mode depends 100% on the requirements and the rest of the access
network design.