How do 1-pipe steam control devices compare?

Therm_lag

Steam cycle controlled by pressure automatically adjusted cycle length as differential took longer to be satisfied during mild weather when long cycles were required to fill piping/radiators.  Likewise control by aquastat produced longer cycles during milder weather.  Both controls could be adjusted to "mild" and "cold" weather settings.  Thermostat control (sending room  conditions) must lengthen cycles in mild weather.  All Energy Star thermostats have adjustable deadband accessible as a program feature.  For larger systems such as multi-unit housing, specialty thermostats for steam, such as R&D, have deadband adjustment as a visible switch.  Setting steam cycle length with outdoor and main (return) pipe temperatures, e.g., Heat Timer, also addresses need for longer cycles in mild weather by initiating cycle length after steam has "made" main loop (similar to classic aquastat).  Thermostat and cycle timer controls  now dominate single-pipe system control.   Have there been tests of control efficacy in one building that had two types of control alternately applied?