No question polyurethane is a better for handling and last much longer, I have used it in many builds, I since have went back in some builds to rubber as the road & engine vibration for a car that is going to be driven can be much rougher. I have even tried the graphite impregnated polyurethane and it still transmits vibration since the durometer is so much denser than oem rubber, no squeaks though. I had a buddy that had a '67 vette, top notch build with all polyurethane bushings, granted they never rode good but it was unbearable until he replaced the polyurethane bushings, literally you needed a mouth piece to ride in the thing and thats not exagerating much, but it handled like a slot car! On my latest build I used energy suspenion on all the suspenion bushings but rubber engine & tranny mounts and it seems to be better for my application (no road coarses here) but my car doesnt shake as badly as my all polyurethane '32 at the stoplights.