What's the difference between Korean chemical sunscreens and Western ones like La Roche-Posay or EltaMD?

Across the reviewers we read, the consensus is that Korean formulas (Round Lab, SKIN1004, Haruharu, COSRX) tend to feel lighter, more serum-like, and leave no white cast, while Western pharmacy sunscreens like La Roche-Posay Anthelios are denser but often carry stronger water resistance and higher SPF numbers. Korean products in the US market use older FDA-approved filters, which specialist subreddits frequently flag as a tradeoff.