Kyojuro Rengoku surpasses Tengen on many levels, be it strength, Breathing Technique, or battle Intellect. So to cut a long story short, Kyojuro Rengoku is more powerful than Tengen Uzui.
Demon Slayer's Tengen Uzui is considered to be one of the weakest Hashira due to almost losing this fight, but the fact is that Tengen only looks weak when compared to the most overpowered Hashira.
Was the Flame Hashira Kyojuro Rengoku stronger than the Sound Hashira Tengen Uzui? Rengoku is most likely stronger. Tanjiro says in #131 that Rengoku was “stronger” than anyone else. This would include Hashira he has seen in combat like Tengen, Mitsuri and Muichiro.
In terms of physical strength, Tengen Uzui is far from being the weakest Hashira. While his feats throughout the Daki and Gyutaro battles certainly displayed this, there's additional evidence to show that he's not the weakest Hashira.
Tengen Uzui is the second strongest Hashira in physical strength, only being surpassed by Gyomei.
7 Strength: Tengen
Rengoku was an elite fighter with immense strength. He was able to fight Akaza, who was a member of the Upper-Rank Three. Even after sustaining serious injuries, Rengoku still had enough power to hold down Akaza, and was able to send Akaza fling into the forest with a single slash.
Shinobu Kocho (The Insect Hashira) While we don't necessarily think Shinobu Kocho is physically weak by any means, we do believe that she is currently positioned at the bottom of the totem pole compared to her fellow Hashira members.
Tengen Uzui
This Breathing Technique gives him echolocation and other advanced hearing abilities. Even though he is large and muscular, and uses that to his advantage, his fighting style relies more on aesthetics and flashiness. He is the fastest Hashira, and the second physically strongest.
Sanemi's blood is known to be enticing yet intoxicating to Demons, which he used to bait and stab Nezuko. Sanemi is clearly the least popular Hashira among Demon Slayer fans.
Kyojuro Rengoku surpasses Tengen on many levels, be it strength, Breathing Technique, or battle Intellect. So to cut a long story short, Kyojuro Rengoku is more powerful than Tengen Uzui.
Gyomei's raw strength and ability to use Transparent World makes him the strongest Hashira and therefore, he is leagues above Rengoku.
Uzui Tengen, or the water hashira. Giyu Tomioka. And I'd say that in the initial stages of this fight, it'd actually be pretty even, because I think we can all agree that. Uzui is most definitely the stronger one of the 2, at least physically speaking, while Giyu is definitely the faster of the 2.
Shinobu Kocho Is the Weakest Hashira
Of the three Hashira who were killed by Upper-Ranks -- Rengoku, Shinobu and Tokito -- Shinobu was the only one who was killed almost instantly when she encountered Doma, Upper-Rank Two.
1 QUIET CHARACTER: Gyomei Himejima Is Soft-Spoken
The stone Hashira, Gyomei, is a gentle giant who is patient and firm like the earth itself.
Gyomei Himejima is the strongest Hashira in Demon Slayer. This fact has been established in the manga as Tanjiro, Inosuke and Zenitsu all agree that he is the strongest member of the Demon Slayer Corps. His strength was showcased during the fight against Kokushibo.
1) Shinobu Kocho
The Insect Pillar of Demon Slayer Corps, Shinobu is undeniably the smartest individual. She might not be physically stronger than others, but her intelligence is what kept her going.
7) Obanai Iguro
Many fans argue that he is faster than many of his peers because of his battle against Muzan. Despite being wholly blinded, he could go toe-to-toe against the Demon King. If he had perfect vision, Obanai would have been even faster. His technique focuses on twisting and bending the sword like a serpent.
1. Gyomei Himejima. Gyomei Himejima, the Stone Hashira, is the strongest Hashira in the Demon Slayer corps in terms of strength and swordsmanship. He is the only person who uses spiked flails and an axe instead of standard swords to kill demons.
1. Gyomei Himejima – The Stone Hashira.
Killed And Was Killed By Doma
Before arriving at the Infinity Castle, the Insect Hashira consumed roughly 81 pounds of wisteria poison. Even though Doma killed her, he died just as quickly because of the sheer amount of poison he ingested after eating her.
Tanjiro's Current Demon Slayer Rank Is Kanoe
Murata, the Demon Slayer, who was almost digested on Mount Nagumo, is also a Kanoe.
The secret to Gyomei's powers is that they are governed, regulated and enhanced by his emotional capabilities. So in a sense, his crying is a sign of his strength rather than weakness. As a gentle giant, Gyomei's character can be seen as a deconstruction of what makes a person strong in Demon Slayer.