A lot of this is personal preference I know but what do you think is most efficient given a specific level of gear? Presumably the fact that a lot of high level people I see use ww/hota hybrid means this is the best in terms of bang-for-your-buck. Having said that I can't help but feel you are compromising the beautiful synergies of a ww barb for the sake of a single target dps that assumes you have sufficient fury to spam (basically you are trading a fury generator, itself a compromise on the 'pure build', for a high damage, non-fury generator).
I have tried a pure hota barb using thunderstrike, rend:bl and op:ks. The farming speed undoubtedly goes down but kill speed on elites goes up. There is also an extra slot for fury gen, ehp (warcry) or extra cc (best served cold) depending on the situation.
Pure ww is what I am most comfortable with although no fury generator can lead to frustration, in particular when I start lagging. It is obviously weak against kiting mobs and single targets, however, provided your deeps are sufficient for the mp level you choose to play then a couple of rends should do the trick (failing this you can always ignore a mob).
I'd like to know what people's opinions are on these three builds. For the hota/ww hybrids, do you prefer keeping op or rend? How much time do you spend wwing vs hota? Is ww/rltw just to maintain fury and kill off weak mobs?