Phi Phi Island is far more beautiful but both are equally touristy and crowded. To choose one to visit depending on your itinerary. If you don’t want to go far south but rather stay close to Bangkok then you can go to Pattaya. But if you want to explore southern Thailand, there will be plenty of beautiful islands that you can even skip Phi Phi island for better places.
Basically, if you have very little time in Thailand but want to go to an island, Koh Larn (Coral Island) isn’t a bad choice. However, if you really want to see beautiful beaches, then go to the south.
Source: From Quora
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