Which smart thermostat is best for multi-room temperature balancing?

The ecobee Premium ships with a SmartSensor and is designed around occupancy-based zoning, and the Google Nest Learning Thermostat (4th gen) bundle includes a Nest Temperature Sensor. Across the reviewers we read, both rely on remote sensors to even out hot and cold spots, though r/Nest threads flag that Nest sensors are limited compared to ecobee's broader sensor ecosystem.