1. Peak Escanor
2. Danafor Meliodas
3. Merlin
4. King
5. Gowther
6. Ban
7. Diane
1. Escanor is first because Meliodas said he was stronger then him, Merlin said he was the strongest sin, Nakaba seems to imply that he really is the strongest sin at his peak, he's a special singular existence unlike any other, nobody else has power like his, was said to be on the same level as estarossa(not even Mel got that praise when all of the commandments sensed he got his power back), and estarossa doesn't seems to really care/not be worried by it, killed two commandments in one battle, almost killed a third (glox) while he was at his weakest, etc. Yes he is vulnerable to some forms of hax like mera's soul manipulation, or Gowther's memory manipulation, but in both instances he was only effected because he let them do their thing, not really wishing to fight either. He could have nuked both outright and killed them had he wished, so as of right now, escanor doesn't really have any real loses, or exploitable weaknesses.
2. Main character, major player in the battle 3000 years ago. We already saw his full power, his danafor feat. Hyped to be a major threat to the demons. Has the greatest destructive feat in the manga. Very versatile with full counter, cloning, and demon power to atomize enemies. If he doesn't have the power to kill an enemy himself his set of abilities his well designed to make the opponent end up killing themselves by turning their attacks on them. Strength increases with rage. Admitted to not being able to defeat two commandments at once, which is something escanor did accomplish. Even at his best, with his strongest attack, did not oneshot kill fraudrin, whom is only a substitute commandment.
3. Merlin. Secretive. Probably has all sorts of hax spells, making her pl not matter . Can make a perfect cube that even galan said was hard for him to break. Most likely has more hax. Nerfed and put on ice by Nakaba almost as soon as she rejoined the sins. Managed to k.o Meliodas and steal all of his power(although she suckered punch him). Can also amp her owns spells as well as others , and enabled Gowther to k.o escanor with one of his weaker memory attacks.
4. Fairy King. Disaster ability to makes light wounds more dangerous, or lethal. Weak physically however, and to physical damage. Great magical ability. Has very versatile weapon. Was one of the strongest sins with a 4K pl. still has room to grow and get wings. Can boost his power to 10k if things get dangerous.
5. Gowther. Too dependent on his memory manipulation. Not to good in a fight. If you can dodge his arrows, can be defeated fairy easily. Not to strong either physically, or in terms of magical ability. Said Diane in her human sized form would give him trouble if he didn't have his sacred weapon while she didn't have hers. However if he can get the memory manipulation off, he can probably oneshot.
6. Too dependent on immortality. He knows he can't die, so no need to improve himself and get more powerful. Not good at dodging, blocking attacks. Can easily be oneshotted by hax because he will most likely let it him. However he does make up for the fact that he doesn't improve himself by having the ability to steal strength and speed from others although this is a limited amount.no magical abilities to speak of, if he can't defeat his opponents through brute strength he will lose as he has nothing to fall back on.
7. Weakest sin. Decently versatile with the ability to manipulate earth. Decent amount of physical strength. Easy target in giant form, not too fast either. If she can't overpower her opponents with brute force she will lose as she has nothing to fall back on. Has good durability however do to size, and skin hardening magic. Has no means of even given herself a temporary power up in times of need. A lot of potential to unlock.