I've been noticing for a while that many new investors get confused about stocks. Some believe they all work the same, but the reality is that common and preferred stocks are completely different beasts. Let me explain why it matters.

Basically, when a company decides to issue stocks, it has two main paths. It can issue common stocks, which are the most typical, or preferred stocks, which are like a rare hybrid between a stock and a bond. Each has its own rules of the game.

Let's start with the most obvious: voting rights. If you have common stocks, you can vote at shareholder meetings. This means you have a voice in important decisions, like who leads the company. With preferred stocks, that right simply doesn't exist. End of story. Some investors see this as a limitation, others don't mind because they aren't interested in management.

Now, regarding dividends, this is where it gets interesting. Common stocks offer dividends that vary depending on how well the company performs. In good years, you get more. In bad years, less or nothing. Preferred stocks, on the other hand, usually have fixed dividends or a predetermined rate. It's more predictable, more stable. Some types even accumulate unpaid dividends for future periods, so if the company faces temporary difficulties, you don't lose those payments.

Here's what many ignore: if the company goes bankrupt, not everyone recovers the same. Creditors and bondholders get paid first. Then come preferred shareholders. And finally, common shareholders. That is, if things get ugly, common stock owners are the last in line. Preferred stockholders have a better position.

In terms of growth potential, common stocks win hands down. They can appreciate significantly if the company grows. Preferred stocks, not so much. Their value is more tied to changes in interest rates than to the company's performance. Think of it as the difference between investing in a startup with explosive potential versus investing in something more conservative.

Liquidity is also different. Common stocks are constantly traded on major markets, so buying and selling is easy. Preferred stocks tend to be less liquid, with restrictions and special clauses that complicate things.

So, who should invest in what? If you're young, have a long time horizon, and can tolerate volatility, common and preferred stocks can coexist in your portfolio, but probably common stocks will be your main bet. If you're close to retirement or just want predictable income, preferred stocks are your best friend.

One thing worth mentioning: there's a huge difference in how these two types behave during interest rate cycles. Look at the S&P 500 versus the S&P U.S. Preferred Stock Index. Over five years in a changing monetary policy context, the S&P 500 rose 57.60%, while the preferred stock index fell 18.05%. This perfectly illustrates how they react differently to market conditions. Common and preferred stocks are not interchangeable.

If you want to start investing in this, the process is simple: choose a regulated broker, open an account, carefully analyze the company you're interested in, and execute your order. Some brokers also allow you to trade CFDs on these stocks without holding them in your portfolio, depending on what they offer.

My advice: diversify. Mix both types according to your risk profile. Keep regular track and adjust when necessary. Understanding the differences between common and preferred stocks is not just theory; it's the foundation for making smart decisions.