It is really about personal opinion.
Having poly at both ends will provide the best ride quality going down the road.
Having the bushing on the body side and spherical on the rear will give the solid suspension response but still ride good
Spherical at both ends has the best articulation and the most direct suspension response you can get but tends to be noisy and a bit bangy while driving.
Peronally, I have no problems living with spherical bearings at both ends. Drove my 91 RS around like that for years and as soon as I have money to upgrade the suspension on my 99 I will be doing the same again. The spherical ends do require a little more attentive maintenance to keep clean and lubed
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