Power??? Maybe.Renji>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Gin
Its come to my attention people think otherwise :|
So let me explain this. Ichigo blocked Gin's blade in bankai form, easily. Despite it moving many times the speed of sound or whatever. Anyway, now i dont like to use A>B>C logic but Renji's power and speed far outclasses Ichigo's at the time. So Renji could smack it away easily and potentially break Gins bankai. His skull has tanking abilities, so Gins bankai could also easily be deflected by that. And Renji's Teppou shits on anything Gin can do. So that about cover it?
But Speed??? Definitely not (From what we've seen this far).
And while Current Renji is definitely pretty damn strong, Gin is actually underrated on the base (From what I've seen this far that is)
Because of his Bankai power he can 1 hit pretty much anyone if he lands a direct hit. And due to this and his swords length and speed all he has to do is point his sword at the enemy and it's pretty much over.
And just try to imagine him in a fight with no knowledge. If the enemy doesn't know about his power he can kill them before they even draw their sword (If they have no knowledge about his sword, then him pointing a sword at them from 50 meters away doesn't seem all that dangerous. But at soon as he does that he wins the fight though).
So in a fight without knowledge there are barely anybody who can beat him.