I'm sure they all can set the temperature. Our portable unit only sets the temperature in five-degree increments, though. I've yet to see one that can set the RH. That probably would be a good feature to have.Most portable acs these days have the option to either a) set the thermostat or b) humidity % level.
Also, our portable unit only exhausts air through a single tube in the window. That slightly lowers the air pressure in the room by sucking air into the room any way it can. I understand some, especially window units, do it differently. They keep the inside air inside and the outside air outside. That's the best type for a grow space because it doesn't vent plant odors to the outside.