I wouldn't touch the rears, as they hardly do any work.
When I last changed the rear discs&pads on my Passat, the guy at GSF said they had some uprated pads on offer for the same price as std, so I tried them.
The handbrake never worked very well afterwards, used to have to pull it on really hard and it still wouldn't hold on slopes even after several thousand miles to bed in; not 100% sure - but I wondered if it was because the uprated pads didn't offer as much friction when cold.