1. Naruto
2. Bleach
3. One Piece
4. Fullmetal Alchemist 🙄

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One Piece
Sengoku Youko
Yu Yu Hakusho

can't choose between them

one piece
i think is the best but not sure 2nd or 3rd spot they keep changing

I am addicted to almost mangas of Takeshi Obata sensei with Tsugumi Ohba sensei and Hotta Yumi sensei - all of it is shounen , such as :
-Hikaru no go (a great manga about igo . Although i was disappointed at the ending , whole story still is amazing, i even learnt how to play go after reading it )
-Bakuman ( OMG , i have never thought that a manga about manga production can be so interesting like that until i read bakuman -a beautiful story about friendship , hope , faith ,love,dream ,hard-working ....)
-Death note (It's a popular one ; i alway keep wonder whether a human mind can make a intelligent plot like all of those manga ; and the artwork can not be more perfect XD )

  Beside , I love a lot of manga related to sport like eyeshiel 21 ( murata sensei , American football ,you can read "one punch man " of this mangaka - It's not about sport , but kinda fun ) , King golf ( Golf ofcourse ) , Slam Dunk (basketball) , Prince of tennis ...... I know that MC or MC's team will win ,but i can not stop reading it till the end . 😃 

  Finally ,a series which I love the most is Gintama (when my mother forced me to sold all of my manga and anime stuffs because of my fail in college entrance exam , I did everything like she wanted except selling this series ) . MC is a lazy ,miserly old man (he is over 30 ,i guess) ,but the coolest hero in my heart   😎  

(p/s: iam trying my best to take back all of my beloved stuffs and travel to japan next year , after next exam (my mother promised ) 😀 )

that's very hard, and i don't like say so many answers so i just say one that is best shounen
Cage of Eden

If you ask for the only one 'personal' best Shounen, I will go with Black Cat.

Gotta be either Dragonball or One Piece, both have a huge audience from young to old

Naruto
Bleach
D.Gray-Man
Death Note
Ao no exorcist
666 Satan
Deadman Wonderland
Samurai Deeper Kyo

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subir fotos

Konjiki no Gash!! (Gash Bell for short)
The art style complements the humor of the series.

Bakuman
Very influential if given time and interest. It could also change your perspective on manga.

Ares ! it's about medieval warefare.. really good.

The best one for me is angel densetsu. I really liked all the characters and there interactions with each other. This manga doesn't have that much of a great art but if you can get past through that bit this manga will actually be very enjoyable and hilarious.

Zatch Bell is definitely underrated (from what I know), and needs to be read by more people. Gintama and One Piece are probably some of the best ongoing ones.

I love D.Gray-man, BLEACH, Tsubasa Reservoir Chronicles, Bakuman., and many more - but Pandora Hearts deserves the title more.

“If I'm going to just live taking someone else's place, then it'd be better if I could just be a pebble. That way, there'd be neither misunderstanding nor confusion, and then even you wouldn't know me.” — Eine Kleine (Kenshi Yonezu)

Best of all time is definitely Doubutsu no Kuni and Fullmetal Alchemist.

Running is One Piece and Hunter x Hunter.

Seriously how can a great manga like Doubutsu no Kuni be SO underrated?! 😕

Chinese Translator Accepting translation requests if the manga interests me!

I answered the question exactly as the OP wanted.

The best of all-time: Rurouni Kenshin

The best running currently: Kidou Senshi Z Gundam Define

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb