OK, let me explain it. Yes, the assets owned by both funds are financial assets that are comparable. They both own bonds and corporate shares, etc. But the issue is not what assets are in the funds.

When you are given lots of money, this reduces poverty much more than when an individual gets a tax break on saving their own money. Norway has trillions in oil reserves to support a small population. I am not sure why I need to explain this, but having a trillion dollar windfall reduces poverty much more effectively than subsidizing the savings of each individual.

Moreover, when you save each pay period you have to make lots of small little asset purchases, as opposed to making huge purchases in a SWF fund in which the money comes from selling oil, so transaction costs are higher in a 401K style system than when you are sitting on an ocean of free oil.