For a WW Barb...

[morphine]

Should I use grief or botd cb?

[Silver Ice]

neither, use eth botd zerker... its faster then cb, and does more dmg too. and has same range.

[Freedom-Fighta]

Yes. EbotdZ is the best choice, but Brutally Expensive.

Other Excellent options are -
Crescant Moon Legendary Sword - Hits IAS Breakpoint, CTC Static Field (Helpful) and Open Wounds. More Bang for your buck, and cheaper than BotD to boot!
Rare Elites - Ya never know what is hidden by that beckoning yellow text and red UNIDENTIFIED.

On Axes - Beast, Doom, and Death Cleaver All work excellently.

On Maces - IK Maul, Stormslash, and Barnar's all good choices

And for the two handers

Polearms - Bonehew, Tombreaver

Spears - Arioc's Needle

So, As you can see it isnt quite as simple as BotD and forget it, however, im still firm on saying BotD is the best, expensive but the best.