Things such as PCSX2, DOLPHIN etc.
PCSX2 especially because some games only work properly in "Software mode" in which almost everything is done by the cpu.
Intel were long favored over AMD for emulation due to single core/thread speed. Nowadays, with Ryzen, this is moot. Considering that the humble Pentium G4560 runs Dolphin and PCSX2 well, the Ryzen chips have little to no issues here. They are essentially equal to Intel in this task - equal as in a user will run most of the emulator-compatible games at full speed with an appropriate GPU.
Here are several threads I found with a general google search, see if this helps!
Link 1: reddit.com/r/emulation/comments/6t74gg/how_is_ryzen_when_it_comes_to_emulation/
Link 2: gamefaqs.gamespot.com/boards/916373-pc/75828720
Link 3: linustechtips.com/main/topic/864164-ryzen-for-emulators/
Considering i've gotten Dolphin running on a Q8200 i believe Ryzen is beyond fine
No difference between AMD and intel, other than in PS3 emulation where Ryzen will pull ahead slightly against a non SMT intel chip, such as i5 6400, and to a lesser extent the 8400.