this is the biggest technical advantage of modular psu's - the less wire, the less resistance, the less resistance the more efficient
I think you read what I wrote backwards.
There is more wiring between the PSU's output caps and cable end-connectors in modular PSUs since you have to add the wiring and connectors between the main PCB, connector PCB, individual cables, additional solder joints, copper traces, etc. With non-modular, wires are soldered directly next to output caps. No intermediate wiring, connectors, solder, etc.
All else being equal, modular is a wire management and cosmetic thing. With many affordable case featuring MB-tray cable storage, permanently attached cables aren't as much of a cosmetic or management nightmare as they used to be.