In the zodiac, there are 3 levels of strength, energy and power. The middle stage: Pisces, Aries and Taurus. The lower tier: Cancer, Leo and Virgo. And the strongest level: Scorpio, Sagittarius and Capricorn. In between levels are equal wavelength (air signs): Gemini, Libra and Aquarius, which is my sun and moon sign - and my sign group doesn't like to put signs below or above us (or anyone else), an egalitarian genderfluid neutral sign ruled by Uranus.
Signs with the most physical strength, amount of anger or emotions, and what can be construed as "masculine" (destructive) and "feminine" (creative) forces. Aries, virgo and Scorpio fits the bill on cosmic or universal "alpha and omega", esp Aries is sex (ruled by Mars), virgo is birth (the first age of the procession now going to Aquarius) and scorpio is death (Pluto is the ultimate malefic planet). Pisces=psychic powers, Leo=emotional intelligence, and Capricorn=planning and "weeding" - yet not too strong. And "somewhat stronger, but not weak" Taurus is prone to anger while ruled by Venus (so is Libra), Cancer nurtures while the Moon is feminine and maternal, and pretty strong Sagittarius ruled by Jupiter is spiritual guidance and leadership.
And what about the air signs? Gemini is great in athletic ability and business management. Aquarius is about scientific advancement and political reform. And not sure what to call Libra, they are the scales - about the balance of yin and yang - middle point of the astrological calendar year. If Scorpio is the "strongest" vs. Leo "weakest", btw, are fixed signs, where does exactly the bull Taurus stand? Scorpio's opposite. And yes, my Aquarius is a fixed sign.
Fixed signs and fire signs. I would say the four strongest signs are Leo, Scorpio, Taurus, and Aries.
Leos are the lion kings of the zodiac which are at the or one of the top of the animal hierarchy in the jungle. If leos are bad people, they are extremely intimidating. This is anecdotal evidence but I have seen leos making people extremely uneasy and afraid. They are a fire sign and as such, they can be very angry but they are also very prideful, selfish and overconfident. Their overconfidence if it is expressed through manipulative means can make anybody do or believe whatever it is that they want.
Scorpio is the only sign I have ever seen that can match up or compete with a leo. This is because a scorpios psychological insights can push leos over the edge and destabalize them. I have noticed that scorpios if they don't do anything radical like beat up their spouse, they get more respect than anybody else in the zodiac. People really like them. However, scorpios tend to be outshined and outled by leos and usually they don't really care for the spotlight so they willingly accept this.
Tauruses are very emotionally strong. They can go through a lot of pain but they're very loyal, have a lot of patience and are willing to stick till the end. They are like a rock, and they'll be a foundation for you to fall back on. They're very protective over friends and family members and will be there for you and check up on you from time to time. I've seen tauruses have the patience to work very very hard; juggling a job, long hours of study, no free time and still not being agitated. However, if you ever prove to be "full of ****," they will stubbornly cut you out after making you witness their bout of anger. They are good at the silent treatment. But they'll forgive you if they think you're not a malicious person.
Taurus and scorpio are similar. Tauruses are just more simple and practical than the scorpio and will not infect you with psychological BS.
Aries is strong because they possess ambition, physical strength and vitality. They are also a cardinal sign which makes them have the ability to create and achieve things that the fixed signs don't always posses. But usually I would define fixedness as stronger because of the radical nature of where they are standing. They're very passionate about where they stand.
But I would say in terms of strength.
1. Scorpio (the ruthless warrior seeking revenge that has nothing to lose)
2. Leo (the King)
3. Taurus (Farmer that protects family. Paesant but family comes first and will do anything and everything to protect loved ones. I chose taurus because his sense of protectiveness is not materially or ego-based. They are the providers of their family, of their herd. )
4. Aries (Knight)
5. Aquarius (The vissionary, hacker teen, can overthrow system with intelligence, they can be arguably the strongest. However they have little to no effect if no revolution is needed.)
6. Capricorn (Hardworking manager father)
7. Sagitarius (The traveller, fire sign but also inambitious mutable sign that hates responsibilities and hates getting down and dirty)
8. Cancer (The mother, housewife but still a cardinal sign making it ambitious and they also have emotional power)
9. Libra (The lawyer, diplomat, will fight for justice but way too a part of the system, too indecisive, too pleasing to fight)
10. Gemini (the child)
11. Virgo (critic that is very swayed by the patterns of the system, often lacking a personality of its own. So will rarely affect the system)
12. Pisces (old wise man, passifist, escapist, drug addict) This can also belong with number nine with libra or even number 6, if it is a passifist fighting for a cause. However, very often because they have way too much empathy and have an easier time opting out of reality(through drugs and imagination) they usually don't fight people. Also since they are a water and mutable sign, they can merge with other people's feelings and perceptions because they are way too empathetic. That is why they are also very easy to manipulate.
However, pisces is also the least likely sign to pick the wrong side but will bear pain projected on to them.
However, pisces is the wisest of all the signs and probably will escape the physical world much sooner than any of us will.
Also, I define strength in the terms of how much you can affect and influence people, how ruthless and individualistic you are, how sure you are of yourself.