Flushing portable toilet vs standard for a November 2026 office remodel

We're doing a full office remodel starting November 2026, and I need to set up a temporary bathroom for the construction crew and any office staff who have to be on site. The job will last about eight weeks, with 15 to 20 people using it daily, no food or alcohol involved. The unit will sit on level asphalt in the parking lot with easy truck access. I'm weighing a standard portable toilet against a deluxe portable toilet with a flushing bowl and sink. The standard is simpler and cheaper, but the deluxe might be more comfortable for a mixed group over two months. Has anyone used a flushing unit through a Chicago winter? How does the service compare in cold weather?