My top 5 are:
5. FTG
An extremely versatile technique. Anything the user touches gets a contact seal placed on it, making it so that the user can instantly teleport to the opponents location whenever he chooses and dispose of them.
4. Partical Style

ust Release
An Extremely deadly technique that once activated, is a death sentence.To this day, only one person known of has escaped it's grasp:Obito rescuing Sasuke.
3. Perfect Susanoo/Mokuton
These 2 are tied because of their versatility and they both are extremely deadly. From what we have seen so far, the Perfect Susanoo and Mokuton(from Hashirama) are on par with the tailed beast power.
2. Kamui
A very OP technique fueled by Hashirama and Uchiha cells. It traps people in alternate dimensions and subdues them with Genjutsu. Once subdued you are dealt with at the users leisure.
1.Level 2 KM/SPOP
2 of what I think are the very best techniques in all of Narutoverse. In level 2 Kurama Mode Naruto takes on the actual look of the SO6P. Six Paths Of Pain are one of the deadly techniques ever used in the series. The user splits multiple techs into various vessel creating 6 hosts with extraordinary, God-like abilities. Deva,Naraka,Preta,Human,Asura,and Animal Paths are the different techniques bestowed on various hosts.Deva Path is the strongest of all the other Paths becauseShinra Tensei.