http://gf.nd.gov/magazines/may-2013/weighing-effects-length-limits
The above article does a good job of explaining each. I fish a lake in W SD that has a slot. Lake was a minimum length lake but changed to a slot. It gets a ton of pressure and harvest. The slot has been good for fishing but not so much for those who like to keep fish. We now have a year class just under the slot that is providing take home fish. But, by this summer most will be in the slot.
There is way more than what we think that goes into it. Think about hooking mortality. Think about the impact one or two big fish has in the whole system. And the list goes on and on....
I leave it up to the professionals. I have fished lakes that have had minimum length, slots, and one over rules and have disliked and like each in certain cases. Just depends too much on the lake....