in reality it usually comes down to the voltage you like..you can have a 1.2 ohm coil and like it at 3.7 volts which equals x amount of watts based on ohms...a .5 ohm coil will show a lot more watts to reach 3.7 volts....If you like the vape at 3.7 volts with a 1.2 ohm coil youll probably like it with a .5 ohm coil as well.