"..Having said that, one controller is better that two competing controllers."
Controllers don't compete. Same as any multiple chargers. You just have to set their voltages to the same set-points to get them to add their amps all the way up.
If one drops out first because of a lower voltage setting, it may not matter at all. It can be that by then in the afternoon, the battery bank will only accept the number of amps the remaining charger can do by itself. BTDT.
I don't see hardly any diff between PWM and MPPT in real life in our situations for amps to the battery. Only thing is that you must have MPPT to do any drop- down from panel voltage to battery voltage because an MPPT controller has a buck converter in it and a PWM does not.
Big thing is to have adjustable voltages for both absorb and float in either PWM or MPPT--that is what counts.
