To get the most from Ryzen you'll want to overclock so the 1600/B350 is a much better choice then the 2600/A320, plus the A320 may not even support the 2600 unless the BIOS have been updated. Also for Ryzen you'll want to pair it with fast memory, 2800mhz+ up to 3200mhz in dual channel (2x4gb if on budget).