So say I have a 400 watt radiant heater, and an 1100 watt infrared heater, how much wattage would that be???
Just kidding. One thing I think worth mentioning, given that a lot of this answer, as I think John has been trying to explain, is a "feel" decision, not related to the relative wattage ... is that maybe buy/borrow one of each type of heater and give them a whirl. Once the heat from various types is experienced the answer of what feels best, what seems to do the job best, will be answered.