Personally, I like to be really diversified. I have a pension through the union (which I don't add to), also I like to max out my own IRA contributions on top of that. What is left I invest in cheap rentals. You can find cheap 40-60k houses around where I live that need minimal to no work done to them and you can pocket a a good 300 a month off them even after your expenses are covered. That way you get the power of compounding interest through the pension and IRA, and also can get a good 30-40% cash on cash with the rentals. Imagine having 10 rentals at an average of 650 a month all paid off and a couple million in an investment account when you're 50.