If I had your panels I would probably wire them parallel. You have an amp (and volt) input limit on your controller and that could come into the picture if you add more panels. Though, that depends on your storage bank voltage. There are optimal voltages to when pushing the charge through the controller then into the batteries.
Pick your battery bank first, at least as far as voltage. My bank is 4 (up to 6) golf cart batteries at 12 volts, charged by 80 volts into the controller. Not the most efficient curve on the controller because of that 12 volt battery. If I did it over I go with a 48 volt battery bank
I have (2) 400 watt series strings of nominal 12v panels feeding into separate MPPT 30 amp controllers. All I got to do is bolt the stuff up.