The IQ4 does not let you pick the voltage stages like the CW does. You activate the IQ4 and it goes from there. You can turn the converter off and start a new IQ4 run, but you can't make it stay at 14.x any longer than it wants to.
The CW gives you some control, but has only the three voltages, none of which might be what you (your battery) wants. You can beat that by getting an adjustable voltage converter that lets you pick any voltage you want for as long as you want.
PowerMax LK models do that plus they also have the automatic three stage mode if that is all you want your converter to do. Not only that but they are much lower in cost than PDs and Iotas. (and they are not cheapo junk either--just a better deal)
Not everybody wants to use a manual control adjustable voltage converter though. Whatever works for your own operating style is the way to go, even if it not perfect for your battery.