I do think the Banehammer is a very good choice, especially if you want to transport stuff. Its got a reasonably versatile gun that, even if it doesnt kill stuff (for instance if youre on youre lowest damage bracket, or fighting stuff with hit modifiers) can still really mess with your opponents plans.
Of course, the actual Baneblade (and to a slightly lesser degree, the Hellhammer) are pretty decent choices for this, too. Probably more so if youre not planning to use the transport capacity of the Banehammer.
So yeah. Baneblade for killing stuff, Banehammer for tactical shenanigans.