Recently, someone asked me what common and preferred stocks are, and I realized that many investors don't truly understand the difference. So here is my analysis of why this matters more than you think.

Most people think all stocks are the same. Wrong. Companies mainly issue two types: common and preferred, and each plays a completely different role in your investment strategy.

Let's start with common stocks. They are the most typical type and give you what most people seek: voting power at shareholder meetings and real growth potential. The downside is that dividends are variable, depending on the company's performance. In case of bankruptcy, you're among the last in line to recover anything. But if the company grows, your investment grows with it. It's the game of higher risk and higher reward.

Preferred stocks are something else. They don't give you voting rights, but they offer something more valuable if you're seeking stability: fixed and predictable dividends. In liquidation, you have priority over common shareholders. It's like having a bond that behaves like a stock. Less excitement, more security.

What's interesting is that within each category, there are variants. There are cumulative preferred stocks (unpaid dividends accumulate), convertible (you can convert them into common stocks under certain conditions), redeemable (the company can buy them back). With common stocks, something similar happens: there are multiple classes, each with different voting rights.

Now, understanding what common and preferred stocks are in terms of market behavior is crucial. The S&P U.S. Preferred Stock Index, which represents about 71% of the preferred stock market traded in the U.S., fell 18.05% over five years, while the S&P 500 rose 57.60%. That clearly shows the differences: preferred stocks are sensitive to interest rate changes, common stocks follow economic growth.

So, which one to choose? It totally depends on who you are as an investor. If you're in your 30s or 40s and want to build long-term wealth, common stocks give you that growth potential you need, even if you have to tolerate volatility. If you're close to retirement or simply need regular income, preferred stocks are your ally.

My personal recommendation: don't choose one or the other. Diversify. Mix common and preferred stocks, regularly monitor your portfolio, and adjust based on how markets move. Most successful investors I know have both in their portfolio, just in different proportions depending on their age and risk tolerance.

The key is to understand what common and preferred stocks are before investing money. It's not complicated once you see it clearly: common for growth, preferred for income. Each has its moment and place.