For general day to day and "light" gaming you're not going to see much of any difference in transfer speeds, but you will notice a speed improvement from having more memory to cache. I'd choose the 32gb for that reason.

You'd likely see better graphics performance with the 5600mhz kit just due to extra bandwidth, especially on the Ryzen APU option that's more dependent on the memory speed to set the IMC/interconnect speed. But I don't think it's worth cutting your total memory by half- at best you'd likely see a 5-7% fps increase.