so as i get closer to my ar upper buy from bcm i have it narrowed down to two uppers

one has the voltor mur. DD light rail. and the bcm 16inch cold hammer forged barrel.
the other is the same but with the bcm SS410 barrel.
they both cost the same money.

i was looking online and it seems guys are saying that the stainless barrels are not holding up well past five thousand rounds. but the CHF barrel can easly go to 40000 rounds. Is this true......... do the stainless barrels give out that fast.

the reviews for the bcm CHF barrels are saying that they can get .75 MOA groups with good ammo.
so is it worth giving up barrel life for a 1/2 or 3/4 tighter group.

i really would like to know how long the stainless barrel really will last.