I prefer mobility over save every day of the week (especially when the saves are pretty close). The real selling point of the HYMP Broadsides is the fact that *all* their shots are twin-linked.
Of course, for the price you can get *more* Deathtorrent Crisis Suits, so I'd say XV8s. Then again, I've *always* said XV8s are better than Broadsides, so I might be a trifle biased.