Polyurethane or Rubber

I have used BOTH in different cars as well as a little of each in different cars.
A car with full urethane does transmit more vibration. That is certain. The car may have had better steering response as compared to an all rubber bushing car but you do pay for that in reduced comfort.
I have a '70 Charger with rubber LCA bushings, rubber offset UCA bushings but urethane strut rod and sway bar bushings. The torsion bars are huge but the car still rides and drives well. No harshness, no vibrations through the steering wheel.
In the late 90s, many companies popped up to offer suspension rebuild kits. FABO sponsor PST is still around but I haven't heard from Energy Suspension or Just suspension. THey all offered rubber or urethane kits.
Something else....
If your car is worn out, ANY new bushing is going to be an improvement. A full replacement in rubber will tighten up the feel to that of an original car.
When the suspension parts suppliers used to promote the urethane option in their ads, I bought into it. I had full urethane but it was too harsh for me. I'm not a tenderfoot either. I've driven some rough cars. I wanted this one to handle well and not buzz and rattle so I took out the urethane LCA and UCA bushings.
It is also the same advertising tactic that the coil over suspension companies use...."Better handling, tighter steering, less weight"....Well, your $5500 front end handles better than my 50 year old worn out stuff? Really? Your manual steering rack weighs less than my power steering setup? Really ??