If you liked the One Piece manga, the Anime-Planet community thinks you'd like:
The only real similarity between those two series (I can think of), is that they both feature an extremely powerful, but a bit dumb protagonist who is actually good at heart and who can't pass those in need without helping them. There surly are some other similarities, but what I wrote in the first sentence and my "gut feel" will have suffice this time. What I'm trying to say is that, you might enjoy one of those if you liked the other.
Shiki is a young, enthusiastic and rowdy monster hunter who is just starting out. But while most hunters belong to a single guild and only venture into specified hunting territories, Shiki is different. Unlike others, he bears the seal of the forbidden hunter, and as such he only has one goal: to defeat the Forbidden Dragon of Light, Miogaruna. Now, Shiki is teaming up with the reluctant and icy Irie in order to hunt down this legendary beast, but with other powerful hunters seeking to harm him, and countless other monsters in his path, the journey to find Miogurana won’t be straightforward.
in both monster hunter orage and one piece the main charasters are trying to find something sought after by a whole lot of people. Also on the way they meet many nakama and they would ask virtually anyone they come in contact with to be their nakama.
In the year 1580 in feudal Japan, Fifteen-year-old Usagi is a klutz of a ninja who can't seem to complete her training. As she's unfit to be a ninja her great grandfather sends Usagi to Segachi on a very special mission: to marry the skilled ninja Hanzo Hattori and bear his child! However, there's a problem: Hanzo has no desire to be married. Usagi is allowed to stay with Hanzo for one year in order to complete her training, during which she tries her hardest to catch his eye. But lovely rivals such as Yuri and the Princess Sara, and love triangles with childhood friends and others stand in the way of true romance. Will Usagi ever end up with her beloved Hanzo?
Chaseing their dream is important to the people of One Piece and Usagi of Tail of the Moon and so are their nakama, but what awaits them at the end of the road. Will they chose their nakama over their dreams? Will they chase after their dreams? Or will they end up getting hold of their dreams with all of their friends?
Both One Piece and Tower of God are example of Finest manga/Manhwa. Both have wast world which has close to no ending unless author wants(Seriously)
The story in both series is 1st class and there are many side stories/battles going on simultaneously along with the main, which make u anxious and Excited.
Both series are action packed, with one piece having greater comedy parts compared to ToG. Characters are lovable, the devlopnment is good.U would definetly love the other, if u loved one.
One piece after Timeskip and ToG-2 has even more similaritys, lots of new faces, huge power boosts and new villainious Organistaions