For cutting there is no contest - use a hacksaw or heavy duty cutters. You'd be there for hours with one of those tools and it would likely make a mess of it.
Would anybody really try to cut through a SWA with one of those tools?
when the OP said "cut into" I took it to mean making off the end and cutting the SWA back..
obviously for cutting it to length then a hacksaw or junior is good..
there are battery / hydraulic tools available for cutting SWA's to length if you're doing lots of them..