both CPUs are almost on par regarding performance (only 3% difference in single core and 10% in multi core, thus you won’t notice that).
but regarding iGPU performance, the Radeon RX Vega 11 of the Ryzen 5 2400GE is way better, than the HD Graphics 4600 of the Core i7-4790S.
so i would definitely go with the AMD Ryzen.
but don’t expect to be able to run every ps2 game at full speed. for some harder ones to emulate like God of War for example, there might be some slowdowns here and there even with Radeon RX Vega 11 (but there may be some settings in pcsx2-config which could increase performance).
for GC, Wii (both upscaled a bit) and 3DS (at native resolution for some games) you should be fine. For 3DS there may also be some games, which are a bit harder to emulate and/or need setting optimization.