Most companies want both at once ;)
In reality companies need a balance of stables and volatiles. If you only have volatiles you'll eventually crash and burn. If you only have stables you'll ship too slow and too late.
When there's no balance things go really bad. You get people frustrated at the lack of pace from all these damn rules; or pissed off at having to constantly clean up after the cowboys shipped barely-functional crap again. (one of the many dilemmas CTOs face..)
The best result is probably for people to be able to treat stable and volatile as roles - know when to push and cut some corners, know when to go back and tidy up, always respect each other for playing those roles. Hard to do.