In the course of One Piecea plethora of incredibly powerful Devil Fruits have been introduced to the series. Whether they are in the Paramecia, Logia, or Zoan class, the most powerful Devil Fruits usually belong to the strongest characters in the world, and sometimes they are the sole reason behind their incredible power in the first place.
But of all of them, none has the same devastating capacity as Whitebeard's Gura Gura no Mi, which has the power to destroy the entire world. IN One Piecefans have never seen a Devil Fruit that even matches it in terms of offensive power, though there are a few others that do in other, more curious ways.

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Hito Hito no Mi, Model: Nika Can Alter Reality
User: Monkey D. Luffy
At the current point i One Piece story, the concept of gods and mythical creatures is more widespread than ever before. Because of this, fans have seen some of the most incredible powers in the series to date, with Luffy's reality-altering Gear 5 state coming to mind in particular. In this form, he uses the full power of Hito Hito no Mi, Model: Nika.
Although this fruit does not have the same destructive capacity and offensive strength as the Gura Gura no Mi, it still has powers that can seemingly alter reality itself, allowing Luffy to imbue anything he touches with the properties of rubber and even create objects out of thin air. In a one-on-one fight, the Nika and Tremor fruits would be equal.
Ryu Ryu no Mi, Model: Nidhogg is extremely powerful
User: Loki
As wielder of the legendary Devil Fruit of Elbaph, Loki is one of the most powerful characters in the series. The Nidhogg Mythical Zoan Fruit is a relic of the ancient world whose true strength can only be brought forth by a descendant of the ancient giant race, and through Loki this becomes one of the greatest abilities in the world.
Unlike Luffy's Nika Fruit, the destructive power given to the user of the Nidhogg Fruit is definitely comparable to Whitebeard's Gura Gura no Mi, as the sheer size of the resulting dragon transformation allows for extremely powerful attacks. Loki was so strong in this form that he was able to injure Imu himself, more than proving the strength of his legendary Devil Fruit.
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Akuma no Mi boasts the strongest power
User: St. Nerona Imu
Of all the abilities shown throughout One PieceAkuma no Mi might be the most terrifying. Shown as the power of the ruler of the world, Imu, this mysterious Devil Fruit is considered by many to be the first ever, and its powers can turn even Imu's enemies into their mindless thralls who do his bidding.
Like the Nika Fruit, Akuma no Mi's main calling card isn't its destructive output. Instead, it's the plethora of incredible abilities and powers it grants the user, effectively making them the leader of a very powerful, completely loyal army. Although not as physically strong as Gura Gura no Mi, it certainly competes with it regardless.
Yami Yami no Mi can negate powers
User: Marshall D. Teach
In a world filled with incredibly powerful Devil Fruits that could do almost anything imaginable, the power to deny these abilities would be exceptionally overpowered. This power is manifested through Blackbeard's Yami Yami no Mi, a Logia-type Devil Fruit that can remove the devil Fruit abilities of Blackbeard's targets.
At first glance, Yami Yami no Mi actually seems quite weak compared to the Tremor Fruit, as it does not provide the typical Logia trait of intangibles and actually doubles the damage taken by the user. However, the fruit allows Blackbeard to pull anyone towards him, and when he touches them, he completely removes their Devil Fruit ability, making this perhaps the most overpowered Devil Fruit in One Piece which can go toe to toe against any other top fruit.

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Magu Magu no Mi has the highest attack power
User: Akainu
As a display of the power of the Magma Logia, Akainu actually fought Whitebeard in the Marineford War and managed to inflict two significant wounds on the legendary pirate that ultimately killed him. Even Oda himself confirmed Magu Magu no Mi as the devil fruit with the highest attack power in the environment due to its magma properties.
Of course, no fruit in the entire series, except Gura Gura no Mi, has the power to destroy the entire world or even islands. But in a fight, Magu Magu no Mi is one of the best choices to go up against Whitebeard's legendary power. This is why this Logia fruit is considered one of the most powerful of all One Piece.
One Piece can be streamed on Crunchyroll.