Anti-roll bar combination

[aircured]

I have read a few threads regarding the use of beefed up anti-roll / sway bars, but some of the threads contradict each other.

One says that the rear anti-roll / sway bars should not be bigger than the front bar. YET the other thread says it the opposite way round.

I am looking to up-grade both the front and rear bars but I am confused, can somebody point me in the right direction.