I really rate the Bosch aerotwin flat blades ever since I had a retro-fit set on my A4 back in 2007.
Bosch do an OE-fit set for the A3 and they can be had online for about £22, much cheaper than over the counter with Euro Car Parts , even with a discount code.
The Bosch blades currently on my car are much better than the (Genuine) SWF aeroblades that came off.
On my Golf Mk 4 the Valeo blades are much better than the Bosch. I find the Bosch tear easily if there is something on the windscreen leaving arcs of water as the blades move back and forth. No such problems with the Valeo units yet.