A restroom trailer is the clear choice for a high-end corporate event because it provides a permanent, multi-stall restroom experience with full plumbing. A flushing portable toilet is a single-user upgraded unit, while a restroom trailer is essentially a mobile building.
For 150 guests over a weekend with catering and an open bar, you will need multiple units. The event planning guideline starts near one unit per 50 to 75 people for a four-hour event, and you should add units for the longer duration and alcohol service. A single restroom trailer with multiple stalls can serve a crowd more efficiently than a cluster of individual flushing units. The trailer's interior, with its flushing toilets, running water sinks, mirrors, and real doors, is far more comfortable for a corporate crowd.
Setup differs significantly. A flushing unit requires only level ground and truck access. A restroom trailer needs a larger level area, a generator or power hookup, and a water source or its fresh water tank filled. Both options require a service visit during the event. A restroom trailer's larger holding tank may allow for less frequent pumping, but the complexity of its systems (plumbing, power) makes it potentially less reliable than a simple flushing unit if not properly set up and maintained. For a premium experience where comfort and capacity are priorities, the restroom trailer is the more reliable and appropriate solution.