I was recently reviewing my portfolio and realized something that many investors overlook: not all stocks perform the same. There are two main categories that completely change your investment strategy, and understanding this well is key before putting money in.

Common stocks are what most people know. They give you voting rights in company decisions, you receive dividends but these vary depending on how well the company does, and if everything goes south, you're among the last to get paid. But in exchange, you have real growth potential, especially if the company takes off.

Then there are preferred stocks, which are entirely different. Here, you give up voting rights but gain stability. Dividends are fixed or predetermined, and in case of bankruptcy, you have priority over common shareholders. They are basically for those who want predictable income flow without surprises.

The interesting thing is that these two categories attract completely different investor profiles. If you're young and can tolerate volatility, common stocks allow you to aim for long-term capital growth. The risk is higher, but the potential return is too. On the other hand, if you're close to retirement or simply want to preserve capital, preferred stocks offer that peace of mind with more predictable dividends.

From a technical standpoint, common stocks are more liquid; you can enter and exit quickly in major markets. Preferred stocks tend to be less liquid and have sale restrictions that can complicate things if you need money fast.

One fact I always mention: comparing the S&P U.S. Preferred Stock Index with the S&P 500 over the last five years, the preferred index fell 18.05% while the S&P 500 rose 57.60%. That pretty well summarizes the difference in behavior between these two types of investments when monetary policy changes.

My personal recommendation is not to see this as a binary choice. Diversify by combining both. Common stocks give you the growth potential you need in the long run, while preferred stocks act as a stabilizer in your portfolio. It’s a balance that works well across different market cycles.

If you want to start, the process is basic: find a regulated broker, open an account, clearly define your strategy by analyzing the company, and execute your order. You can go for a market price or set a limit price. The important thing is to be clear from the beginning about your risk profile and what you expect from each type of stock in your portfolio.