Worth mentioning that almost every time, the PS2 is the worst platform for multiplatform titles, simply due to how weak the system was compared to both other consoles and contemporary PCs.

There are a small handful of exceptions. GTA San Andreas has complex lighting and effects (which took advantage of the unique hardware and were not possible on other systems at the time, not even PCs), as well as many details that are completely lost on every single other version. The downside is that the PS2 version has primitive shadows, poor frame rates, a low resolution and a very short draw distance. Thankfully, you can mod the PC version (which was actually downgraded even further several times over the years) to add in all of the missing effects and details, making it the best of both worlds. Don't underestimate just how much of a difference this makes. The lighting alone turns this otherwise bland-looking title into a game that can provide surprisingly atmospheric and even stunning moments, despite the low poly count and low-res textures. The more recent remaster tries to unsuccessfully emulate this look, but I would stay away from it as far as possible.

Another example is Need for Speed Underground 2: Only the PS2 version has complex lighting and color-grading effects. They were never ported to other platforms, because just like with GTA SA, they were not technically possible elsewhere at the time.

If anyone knows more games this applies to, feel free to reply.

I should add that due to the low resolution of the system, it's usually a far better idea to emulate PS2 games than to play them on native hardware. On PC, PCSX2 is the gold standard and on Android devices, AetherSX2 is near equivalent, provided you have a beefy enough phone or tablet (lower-end devices might struggle). This also makes it far easier to explore ROMhacks (or should we call them ISO-hacks?), like this upcoming one of Gran Turismo 4:

https://youtu.be/Ct2i7cCaetk

If you want to stick with original hardware, make sure to use a Component cable instead of Composite cable, if you aren't already. The difference in image quality is massive, even if it's rarely ever great due to the messy, highly aliased output of the system in in all but a small handful of titles.