I've got a pension that's based on the market. It's broken up into small chunks because the account has been rezoned a number of times. It's great because I can see how different mixes have performed and the various returns in each segment.
Anyhow....it's all comprised of mutual funds. The cons of mutual funds are that some cost more than others. There are fund managers and they take a cut of the action...but they do it so you don't have to. Just look at the risk ratings on a number of funds and spread them around amongst the companies that offer them: Voya, Vangard, Fidelity, etc... They all have a good mix. Don't forget to do like 5-10% of stable growth like bonds...maybe not in the beginning, but you do want to shift your risk to lower risk investments down the line to protect your investment.
If you think you're going to start withdrawing funds from your account, look at the market and consider shifting money around to withdraw the safest funds first....or the riskiest depending on the current state of the economy at that time. Just know that the number of shares you buy is far more important that the value those shares have at any given time....until you sell....unless you buy stock in a company. Then you must look at stock price, volume, and dividends as a indicator to buy/hold/sell....
Buying stocks with dividends are another way to go long and build shares/wealth without putting much more into it. If you hold X-shares long enough and reinvest the dividends, it can really add up over time. Keep snowballing your earnings, etc...
Just decide the best plan of action to cash out down the road. If you can do a ROTH, it won't count against your taxable income when you withdraw funds. I have a good mix of 401k + pension that are traditional and am trying to stack my roth IRA as a supplement source to those income streams. (not to mention cracking the whip and retiring long before my wife does)