Get the A12 9800p. It is far better for gaming.
Proof:
i5 6200U: Intel HD Graphics 520
FP32 : 115.2 GFLOPS
Texture fillrate: 7.20 GTexel/s
Pixel fillrate: 0.90 GPixel/s
Source:
https://www.techpowerup.com/gpudb/2783/hd-graphics-520
A12 9700p: Radeon R7 Bristol Ridge
FP32 : 1003.5 GFLOPs (8x)
Texture Fillrate: 31.36 GTexel/s (4x)
Pixel fillrate: 7.84 GPixel/s (8x)
Source:
https://www.techpowerup.com/gpudb/2532/radeon-r7-graphics
My stand:
Cities: Skylines is very GPU dependent. The Intel chip may have faster cores, but it has weak Integrated Graphics. So, from the CPU-side, the Intel chip will be a small margin faster in low resolution games.
If you're using the integrated GPU, the one in the A12 much stronger, it utterly crushes the i5 6200U Intel HD graphics. Even if you get, say, a 8th gen AMD chip, (FX-8800p?) you'll have nearly (but not quite) the GPU performance of one of AMD's high-end R7 desktop GPUs. The 7th gen APUs are not much farther behind though.
12GB of RAM makes a difference, games are starting to saturate 8GB of RAM.