I run both. I have 120 Swords currently with 120 Fencing on a stone.
I find that Soulseeker is more of a Vamp weapon, and my Leafblade is more a Whammy weapon. There's really nothing better then Soulseeker for an everyday weapon. I use it pretty much exclusively. *IF* I'm on a boss, I go wraith and use my Leafblade (UBWS so I can use Feint. I lose Evasion)
The leafblade is not imbued... I paid for it, but I think I got a good deal.
48% Hit Life Leech
48% Hit Harm
48% Hit Stamina Leech
Luck 131
SSI 25%
DI 40%
UBWS
If I were making weapons, I'd stick with HLL, HLA, SSI, DI for sure, last would either be HML or Slayer.