Most cars are set up with a ratio of roll stiffness from front to back. You can get there several ways. If the front bar is too big then adding some rear bar could act roughly the same as reducing the front bar. But it is complicated and there are secondary effects. Most people on this forum (Q&A) are never going to push a car hard enough thru a corner to know the difference. It is irrelevant to this thread.

If you guys want to argue sway bar ratios then you should take it over to the cornering forum where it potentially could be a decent discussion.

For a typical street driver JCC is correct. It doesn't really matter which vendor you buy from and a rear bar isn't usually needed. A small rear bar could help out if you have a huge front bar but most street cars do not need a rear bar. A rear bar is usually a tuning aid on a production type car but most people in the Q&A section are going to be using street tires and driving on the street and they are not going to be crawling under the car to tune the rear suspension for the drive to work.