It also has a lot to do with the follower. Some JWs feel that they need a strict environment. They feel that this keeps trouble at a minimum in the congregation, adding more chance of security. These types actually like when the Society and it's appointed men make decisions for them as it lessens the individual's chance of being wrong in God's (read: The WT Org's) eyes.
Then there are those who feel more comfortable in a laid back hall. They want freedom to move and room to breathe. These types are more liberal in their choices regarding "personal conscience matters" and don't want others weighing in on their life decisions.
In my hall, we have had people leave for both reasons. One pioneer couple left to head to a more liberal hall. They are doing very well in their new congregation. Another very spiritual, super zealous family left because they thought our hall was too laid back. They were always finding fault with the personal choices of their fellow members. Now they are in a hall with older elders and a stricter vibe. They also are doing well there.
The poison is often in the minds of the individuals.
But let me add that sometimes, there are halls that are truly toxic, even by the Society's standards. It has occurred that elder bodies can become corrupted to the point that the Society has to step in and try to fix the madness. Congregations are sometimes ordered by the Branch to spilt and reorganize in these situations. Some never fully recover, to the detriment of the followers.