Both are somewhat comparable for now.
My guess is that the ageing 3470 is overpriced and not a good long term buy.
The B250m motherboard will support much higher cpu upgrades.
In addition, the G4560 HD610 graphics may let you defer on the discrete graphics until
you know better just how strong your graphics needs to be for YOUR games.
So far as I know, DDR4 ram starts at 2133 speed, no 1600 speed.
1600 was for ddr3.
Love the ssd; how big? who makes it?
Perhaps you should post the make/model of your proposed parts list.