i went for poly in the race car, but that was for longevity more than anything else, the old rubber was completley perished, just thought poly would last longer,i might be wrong but can't see that there would be any difference in the feel!
i went with split poly when i changed mine last year, hopefully its a fit and forget, as they weren't easy to replace, but enjoyed doing the job myself. although my late cerbera has only covered 20k, the bushes were shot. i also uprated the diff mount.