I say Lucy for the simple fact that her vectors can just touch the inside of Ichigo's brain as she walks past him. If it was a Ready set go fight... still she would win from the reach she has and extra atacks she could do. Also her vectors can stop and pass thru solid and corpral objects thus rendering Ichigo helpless for about 98% of his attacks.
I thought that Lucy had a range of four meters with her vectors. she still can stop the swing and the force behind it also. all else fails she can fling herself away with the others in time. if she can deflect and stop fully auto fire from a mp5 at ruffly 25 rounds a second from over 7 men. no worrys.
At Full power the number of vectors My WIfe Has is only limited by her willpower and their length is at least long enough to stretch across the planet. She is also So accurate with her vectors that she can attack individual cells, And Had reached planet busting level. That being said i don't know much about ichigo after the fight with grimjow so i can't really say yet.
Still... As a hardcore Lucy fanboy I'm Just going to assume she wins.
@rein: Well, she's more like a country-buster. She threatened whole Japan with Nuke-strong Vector attacks. Really, against an opponent like that Ichigo has little chance. Although to be fair it was her "berserk mode". But even then post-timeskip she could crush helicopters flying from the air. Overpower vector-nullifying machines and simply trash a whole research complex. It all depends on whether Ichigo's spiritual sense can detect the vectors or not. Afterall we found out that the vectors are a manifestation of ESP. If he can then Ichigo faces a difficult fight where his opponent can block all but his absolutely most powerful attacks and attack from distance at any angle. And if not then...Ichigo faces quick death.
@battleheiz: Lucy's vectors form a near unbreakable barrier. She can withstand tanks shells and RPGs with ease. Ichigo must pull out a quite strong Getsugai to hurt her. What she lacks in speed makes up by extreme flexibility of attacks and protection.