calmloki
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Well, this points out the value of the "three-legged stool" model.
I do agree with this, but because the OP phrased the question in a way that led us to make our own assumptions, I assumed "all else being equal," meaning similar investment portfolio sizes -- and with that, sure having a pension would be more secure than not. But if you assume that someone who doesn't have a pension has saved considerably more in their 401K and IRA plans, that's not *necessarily* a foregone conclusion.
That third leg could be book royalties, rental income, part time work, horticulture, lots of different things - most here seem plugged in to the stock & bond markets, but there are those who depend on other income sources as the strong leg of their stool.