I think high end multiple rail psus can be just as good as single powerful rail psus. to be honest PJ, the power supplies from corsair are just made by seasonic and probably use cheaper components then their seasonic lineup, those power supplies are not really that great, a lot of people have trouble with them. Any known brand like enermax, silverstone or pc power and cooling are going to use good components in their all their psus so multi rails psus from them would be good too.
I'm not sure if this is using the correct logic but assuming you have good quality multi rails they can be even more effecient than having single rail since they are not under so much stress as having the whole system powered from one rail.
I'm not sure if this is using the correct logic but assuming you have good quality multi rails they can be even more effecient than having single rail since they are not under so much stress as having the whole system powered from one rail.