There is always a RAGING debate on that question. It comes down to personal choice.
Take for example the "slammed" mini-trucks and ricers I see everyday. Ever watch the occupants of those vehicles as they drive down the street? I swear their teeth are going to rattle out. Either they don't seem to mind or they aren't going to admit that the ride is terrible - BECAUSE IT'S COOL. Yeh, right.
Some people are happy with poly everything, some people rubber, some people a mix. The problem is that you want to get it right the 1st time as you sure don't want to take the car apart again to make changes.
I am an engineer by trade and after everthing I read, I went with rubber subframe mounts and poly suspension bushings. I figured I could tighten up the handling but still isolate myself from the vibrations to a degree.
In the rear, I went poly on my spring mounts but rubber isolation pads between the axle and the springs. I figure that I will limit spring twist/deflection at the bushings but I am isolating vibrations at the axle mounts (which don't flex and therefore would not compromise handling). What I am looking for is a muscle car that handles really well (I have installed tubular upper and lower control arms and a 1-1/8" front sway bar too) but won't ride like my 25 year old 4X4 truck.
Unfortuately I have yet to get the car back on the rode to test, but then I only drove it twice before taking it apart and would not remember how it rode (with shot bushings) anyway.
If you go over to the Team Camaro or Dave Pozzi's website, you will see that Pozzi is a HUGE fan of Del-a-lum suspension bushings with solid aluminum body mounts. The theory is that unibody cars have the front subframe welded to the body and it works. Me? I am too afraid of spending years working on a car just to find out it rides like a skateboard.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI