Instead of an rpi, get this

https://www.amazon.com/Lenovo-ThinkCentre-Professional-Certified-Refurbished/dp/B075FHNZC8/ref=pd_cp_147_2/138-8112557-6022445?_encoding=UTF8&pd_rd_i=B075FHNZC8&pd_rd_r=9d8d86cc-c0a5-47ee-8ba6-324a0bf937a3&pd_rd_w=HCJeS&pd_rd_wg=s5qU8&pf_rd_p=0e5324e1-c848-4872-bbd5-5be6baedf80e&pf_rd_r=WZQ0ZV9W59YZMQCBSXEX&psc=1&refRID=WZQ0ZV9W59YZMQCBSXEX

or for a little more, this one is even better:

https://www.amazon.com/Lenovo-ThinkCentre-Dual-Core-Processor-Refurbished/dp/B07G4LVZQZ/ref=sr_1_3?crid=Q8K998FBBWKM&keywords=lenovo+mini+pc&qid=1577472397&sprefix=lenovo+m%2Caps%2C194&sr=8-3

It's super small, similar price, and its a full blown windows PC, and it is FAR MORE POWERFUL. So not only do you get a lot more power, it's windows 10, so you get access to WAY more emulators and frontends, and can easily emulate of to gamecube/wii/Naomi and a lot of 3d arcade hardware up to the late 90's and 2000's without much issue. Way more performance features to make the games run, play, and look better. Plus it's great for playing indie games on steam and other pc games.

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I just cannot recommend RPI based solutions unless you have a super small form factor, as it is very limited