So, obviously the PC version (or well Scholarship Edition in general) came out after the original PS2 version. There was dramatic graphical changes as it runs on an entirely different engine. In some aspects... the PC does look better, but at the same time I personally still really like the PS2's look. It looks a bit more realistic to me in a way, except for the shitty shadows.
I think the PS2 version really thrives in interiors, but the PC version probably takes the win when outside.
Here's some screenshots I took on both PS2 and PC in similar situations so you can compare. Here's some details about the screenshots:
The PC screenshots I took running max settings of the regular patched version of the game. No graphic mods or world.img mods at all.
The PS2 screenshots I took on PCSX2, I was running in software mode. I had 6x native resolution and some anti aliasing.
If you can't tell which is PC and which is PS2, just look for the clock. When I took the screenshots I didn't unlock the clock yet so the PS2 screenshots lack a clock.