I don't know about the roller bushings. Never saw them.
The factory bushings are friction-less. The ruber is a frictionless spring. The rubber is twisted as the suspension travels,and again, acts as a frictionless spring (or torsion member). That is why it is important on mopars to set the ride height before securing the lca's and uca's.

If the ride ht is set to factory limits, then as the car rises, they would resist the motion. The good side is, as the car corners on a turn, they also resist this motion. By adding a spring rate as the bushings are twisted.

You could do better to set the ride ht real high, then as the car sits at the line, the rubber bushigs are helping you to push up the front. The down side is, when the car is at rest, that the bushings will have a lot of pre twist in them. This will cause them to fail prematurely.

Don't even think about talking about poly.