So, which one is the correct one? I understand that this is just a form of naming a very well known phenomenon of how our personalities can differ and modify the outcome of how we present ourselves. Isn’t the Omega Male just a sort of introverted Alpha Male?

“Most people are at least aware of the alpha male and the beta male from popular culture. We even wrote an article about the alpha male, the beta male and the jerk. However, there is one other type of guy in addition to the traditional two: the omega male. If you have no idea what an omega male is, let me remind you that alpha and beta are the first two letters of the Greek alphabet; omega is the final and 24th letter! The whole alpha, beta, omega thing isn’t really terribly scientific. But, it’s certainly grounded in evolutionary biology, since all animal groups tend have to dominant leaders (alphas) who get to mate the most and pass on their genes, and submissive followers (betas) who rarely get sex. In humans, an “alpha” isn’t the dumb, grunting bully, but a socially successful, confident, and charismatic guy, who leads at work and gets his choice of a variety of women. A “beta” is usually a passive, boring type of guy, who ends up being a “cog in the machine” at work and socially invisible to both men and women. The Omega may be thought of as such an extreme beta that he is on the fringes (in terms of evolutionary genetic “fitness”) of the community or tribe. Thus he gets few resources, like food and sex, and may even be the target of aggression from others within the colony during times of unrest. Men won’t befriend him and women don’t find him attractive. Omega males are the last place according to the terms of society (socially, at least). They typically lack drive to succeed in mainstream ways and have few social skills. An omega male often doesn’t know the line between appropriate and inappropriate or ignores it. Basically, Omega males lack common social skills, and have an inability to read social cues in others. If the conversation turns really creepy and awkward very quickly, it’s likely an omega male at work. In fact, the word creepy is often used of omega males. They can’t pick up when someone is getting uncomfortable with them, and they don’t know how to adjust their approach to others, so they may violate body space, stare excessively, and so forth. “ (here you can read more)

So again it feels a bit “off” to me. And what about Sigma?

I believe that the most correct piece comes from Reddit:

Beta Male: You are kind of shy and introverted and not very confident in yourself. You are constantly plagued by insecurities and self-doubts and you can never commit to anything in the fear that you will fail in it. You are somewhat liked by people but they tend to look at you rather condescendingly and woman tend to friendzone you. You are nervous around other people and social situations because you’re always afraid that people are judging you. You are a born follower. As such these types often do well in specialist positions like research science, especially in the fields of physics and chemistry. Customer service is your nightmare.

Omega Male: You are very much like the alpha male, the primary distinction being that where the Alpha “recharges” in groups you “recharge” by being alone. Like the alpha male you are confident, intelligent and have a sense of charisma about you, but unlike the alpha male, you are completely your own person. Your strength doesn’t flow from those around you, it comes from within. You do not need anyone, and you can even be emotionally distant due to your complete self-possession, though you won’t see yourself as distant at all. You trust few people and foster even fewer intimate relationships, people must earn your trust, it is not given freely. Omegas generally make the best leaders, though they never seek out the position. More accurately, it is cast upon them by their peers at which point they reluctantly accept the position until their primary goals are achieved; at which point they seek to leave the position as quickly as possible, which is the polar opposite of the Alpha Male. George Washington is famously Omega in leadership personality and was called “The greatest character of our age” for stepping down from his position of power willingly, despite popular demand for him to stay in power.

Gamma Male: You are sort of the “invisible” guy. There is nothing really spectacular about you. You are not a beta, but neither are you an Alpha or Omega. Your personality and presence usually blends in with the rest of the room and you’re just sort of…there. People like you just fine and you usually don’t have too much trouble with girls, but all the same, there is nothing particularly memorable or remarkable about you. You are not a born leader nor an inherent follower, although you can take on those tasks depending on the situation. In social situations you can often be a neutralizing force, diffusing situations that would otherwise become dramatic. Bureaucrats and diplomacy are two strong fields for this type, though technical tasks performed in isolation, not in a team, are another avenue.

Sigma Male: You are a manipulative mastermind. You are a spider waiting to lay your trap. You possess a cunning, intuitive mind and can sway people to your will. You don’t have the casual swagger of the alpha or the omega but you do have a clever presence about you and people tend to be both wary and respect you for that. You can often be even more powerful than the alpha or the omega male in social situations due to your ability to persuade and manipulate them, though never on points they care about. You are neither a follower nor a leader but rather a wild card. Cyrus Tolliver (Deadwood) is probably the best example of this type.”