Welcome to the Achaea Forums! Please be sure to read the Forum Rules
Unfortunately it seems no one has done a speed comparison yet, at least not with number crunching and posting the results.
Various threads that I have read recommend using the sword for bashing. One thread recommends L1 hammer and L2 sword in pvp.
My limited testing with forged weapons, and the same battlerage strat, have me killing vashnar mountain lions in 29 seconds with a hammer, and 35 with a bastard sword.
I'm in no hurry to buy artifact weapons. I may even experiment with DWB before buying weapons, but I am keen for a discussion on 2h weapons , both pvp and pve.