I'm pretty sure more than one has been on this board, and the general consensus is that jail is a much better place.
The guards have restrictions on their behavior in jail.
depends on the size of the jail. in a small rural country, yeah, jail is better. In a big city, or crime-infested suburb, it's a different story as is prison. I would choose the worst TBS for a year over going into the "tombs" (nyc central booking) or riker's island for a month.
-They are allowed to beat you if they feel threatened. For example: you're in a holding pen with ten other people. two of them decide to fight. Guards will storm in and kick everyone's ass.
-If you try to escape, they can use deadly force
-You will be locked up with people who are serious criminals, not misbehaved teenagers.
-the food is even worse than any TBS. It's always reject food that isnt fit to be sold in supermarkets.
-if there is a violent event, you may be tased, pepper-sprayed, shot with bean bags and rubber bullets, and possibly shot with real bullets.
-The strip searches for jail are much more in-depth.
-there are no toilet stalls in jail
all of these things can happen in a TBS, but they are rare. In a jail, it's a fact of life.