Let me know which direction you'd prefer, and I’ll gladly write that long-form essay for you.
You have better, legal options to enjoy GTA: San Andreas portably without hunting for a mythical PSP ISO.
Do not risk your hardware or personal data on sketchy ISO websites. Instead, support Rockstar by buying the mobile port, or embrace the Steam Deck era. If you must play on a Sony handheld, invest in a PS Vita or stick to Liberty City Stories .
If you want an authentic open-world GTA experience on the PSP, you should play the three titles officially released for the system: Así es el GTA San Andreas en la PSP! | AkiLeX
For the novelty of seeing the familiar Grove Street on a PSP screen? Absolutely. But for a full narrative experience, it falls short.
These games use a modified version of the San Andreas engine (RenderWare). They feel similar, feature radio stations with similar vibes, and run at a smooth 30-40 FPS on original hardware.