The SP120s don't need to spin up enough to get loud if you have two of them, but at least you know they always have plenty of capability just in case.
If you do not run the SP120s at 100% speed, is pointless to buy those over the Apache. Because to match the "silence" of the Apache at 100% you need to run the SP120 at around 40-50%.
But at that setting, are worst than the stock fan by miles. Which is quiet and adequate also.