what i've found is.
there are poly bushes and poly bushes. and most of the advertiseing is bollox.
i like polybushes cos theere easy

. duff them in job one no takeing subframes off and trying to get them in the press. what i no likey is that there performance claims arent exactly true dought meany people have gone from new std bushes to new polybushes once you have you'll realise they arn't all that.
for balls out performance use spherical bearings. for performance and a littel comfort use rubber based bushes ( not nessaserly std ) you can get some with thicker steel inserts and less rubber, these are awsome.
for the fast road / track car or fast road daily its a minefield. take your best guess and change it if it's not right
for the old shed of a daily driver you just want to bang through a mot and have to fix on your driveway, polybushes every time