I think the idea behind the high-output MC cartridge is that you can use an MM phono stage. This is desirable because the price difference between a really good MM stage and a really good MC stage is big.
My advice would be to switch back and forth. You'll find that you eventually leave it set on one.
Another piece of advice would be to see if you can demo the EAR step-up transformer and a low-output MC cartridge. I would guess that perhaps Music Direct, who carries the step-up tranny, would also have some cartridges that were traded in for upgrades that they would consider sending out for demo purposes, because I'm guessing that not many folk let people demo new cartridges.
My advice would be to switch back and forth. You'll find that you eventually leave it set on one.
Another piece of advice would be to see if you can demo the EAR step-up transformer and a low-output MC cartridge. I would guess that perhaps Music Direct, who carries the step-up tranny, would also have some cartridges that were traded in for upgrades that they would consider sending out for demo purposes, because I'm guessing that not many folk let people demo new cartridges.