It all depends on how the lanes are you're bowling on...
On dry lanes: The Eruption will be stronger in the back and overall. The Benchmark will burn up a ton
On oily lanes: The Benchmark will start rolling through the oil where as the Eruption is gonna skid for days! The Eruption coverstock hates >>>oil<<<
Two very different balls,etc. On a house shot, the Eruption is going to be the Big Skid flip reaction and the benchmark is going to be smooth no matter how you roll it...