Seen all of these "Maniac Cop 2" is my fave in that series, I do not recommend "3" tho, it's pretty weak.
It's been years since I saw "Prison" so I honestly remember very little about it. I know the director (Renny Harlin) went on to do "Die Hard 2" and "The Adventures of Ford Fairlane," for whatever that's worth. Big dumb shoot em ups were his specialty, he was kinda like the Michael Bay of the 80s.
...then he married Geena Davis, put her in a bazillion dollar pirate movie ("Cutthroat Island") that bombed bigtime, and the poor bastard has been stuck in Direct To Video Hell ever since.
Prison was the best of the 3...not that that means much lol...