Which ninja has the best arsenal?

[yep]

DSM ET Kabuto had the best arsenal until Itachi released ET and later Oro has taken his chakra back
#2 Obito
also I think Orochimaru might have some badass jutsus, too bad he was crippled in the beggining of the series but since he finally regained his arms I think we will see some forbidden jutsus in his next fight (except if Kishi's planning to troll him again)

 

[BigGuns Reloaded]

Though he is not compared with others but consider just the 5 treasures of the Sage of Six Paths. Anything beats them?
1.) Bashōsen: the fan
2.) Benihisago : the crimson gourd
3.) Kohaku no Jōhei: the amber purifying pot/ultimate seal
4.) Kōkinjō: golden canopy rope
5.) Shichiseiken: seven star sword
They are all for attack and containment. How do you fight them back when u're busy with just keeping urself alive?

true but one needs to be either special or have high reserves

 

[startup97]

Orochimaru, Jiraiya, Pain, Minato and Hiruzen

 

[EZQ]

DSM Kabuto (the strongest shinobi IMO)

Obito's arsenal is pretty good

Kakashi has a very complete arsenal: If they atack him with big atacks, he can use doton to hide or to block, if they atack with fire he uses water etc...
And kakashi's kamui is the Number 1 OP move in NV