PS2 Component Cables (YPbPr) are essential for 480p/1080i on modern HDTVs. Official Sony cables have been out of production for years. Here are your current best sources, ranked.
SCART RGB (CSYNC) → OSSC / RetroTINK 5x / Framemeister → HDMI. Best possible quality. Requires Euro SCART cable (RGC / Retro-Access) + upscaler ($200+).
Avoid "HDMI cables for PS2" that plug directly — they're passive composite→HDMI converters (garbage). Active converters (Kaico, Pound, Hyperkin) are acceptable.