Is water style the strongest single elemental release?

[Lightbringer]

True, but you can't beat Tobirama's water mastery hype.

water mastery might be better, but Kisame's giant shark missile defeats any suiton attack Tobirama has shown since it would absorb any chakra based jutsu to enhance its power.

 

[Xāvî1]

Suitonaikodan no Jutsu > All basic chakra type attacks.

and fuuton kazekiri can cut through anything

 

[H a n]

All depends on what element is going against the other.

 

[Goddess Tsunade]

I think it's wind, and correct me if I'm wrong
but I thought it has been stated somewhere in the manga.

I laughed at the "blood bending" thingy..
that's too much Avatar for you XD

 

[Mitarashi]

LOL.
Your logic sucks.

'The sun is fire, so fire release solos'
'Earth is earth style, so earth solos'
'Air is what you breath, air solos'
ect.

No.
I'd say Futon is the best, due to the versatility of it, or maybe Katon.