Twin Fist
Grandmaster
From the accounts of corrections officers I have seen, they prefer that the inmates have some amenities. It makes the inmates feel like they have something, and cuts down on bad behavior. Plus it gives you something to take away for that bad behavior.
The 23/24 method is basically the SuperMax, which would be fantastically expensive to apply for all inmates. Not to mention unnecessary and inhumane. It's essentially an entire term of solitary confinement.
wrong answer again
supermax requires less gaurds, less facilities (gyms, libraries, classrooms etc), less medical staff (everyone in solitary, less injuries), less of everything.