Pain's Giant Dog
Six Paths of Pain
Ma and Pa Toad
I'm taking best to mean. Coolest and most impressive. And, to me, Naruto's summoning of Gamabunta during his fight with Garra and Jiraiya summoning him during the Tsunade arc were definitely the high-points for summoning in the series.
kakashi's dogs not just pakkun.
Fukasaku. He's the most varied summon up to date. Although he works best in synch with Shima, I'm not nominating a duo, and Shima just isn't as cool to me. Fukasaku has gotten more development and is a cool character. It's a shame that he hasn't been in the story for so long. I really enjoyed his frequent screentime during the Amegakure and Pain Invasion arc.
I always like the original Manda...his fighting prowess was well shown against the other summons of the Sannin...use of deceit and ninja like techniques, plus great speed and power is all one needs from a summon
Worst summon is Sasuke's Eagle, because it was an ass-pull...quite literally.
I loved Enma the most.
Kyuubi. if it wasn't for Minato, nobody would have stopped the Kyuubi back when Tobi controlled it.
I go with Kyuubi 'cause he's the strongest Bijuu and his combo with Naruto this weak was godlike
Enma - very novel...close relationship with summoner...was had to choose between him, Ma and Pa and Gama...
Gedo Mazo is way tougher than others