Small things make a big difference in quality of life in prison. Especially for people who don't have money. It might be more expensive for CA to buy friends and protection in SD but he's also probably not constantly looking over his shoulder and worrying about all the Miami gangsters trying to work him over. "Hey, my boy drove past your parents' house yesterday, your dad's car plate is XXXXX. You should put 50 in my account".Prison is still prison. You’re confined. So whether you’re confined in Florida or South Dakota in the existential sense there’s no difference.
And the more permissive a prison is about what's allowed, the easier it is for someone who does have money to buy protection and friends through care packages or commissary funds.
TLDR: CA is going to be safer and more comfortable in SD and it'll probably be cheaper now that they don't have to keep him in segregation or protected status.