Thats for you to decide.
Good poly bushes should be stiffer than a 'standard' bush. So the car feels a little tighter and more stable in turns. The offset is a harsher ride, and more road buzz getting to the cabin (marginally). This may be compounded by any suspension lowering you have.
So if its a track car, poly is probably the way. But for road, its whatever compramise you want.
Bearing in mind that new standard bushes will be miles better than sha**ed old ones anyway, and cheaper than poly.
If I rebushed my car again, I would mix it up... Poly bushes on the steering rack mounts, front sub frame, roll bar and links (all for stiffness and durability) then standard bushes on the wishbones and rear beam (reducing the comfort reduction a bit).
New suspension top mounts would be good at the same time if you have not done them before.
It would be nice to replace them all at once, to notice the differnece!