If you want to test to detect for infectious people - accurate Rapid Antigen Testing then RAT tests are the best option - for fast detection & isolation/limit spread
2/ If you want to use PCR tests that are 10 times as expensive and take 1-4 days for a result to find out if you have minute viral fragments but not if you have a high viral load. Go for PCR.
3/ Read a tweet about comparison between RAPID ANTIGEN TESTING vs PCR (I have changed it slightly)
Rapid Test is like using binoculars to tell if there is a bird sitting on a branch in a tree in the distance - A PCR means you hike for days all the way to the tree, climb…
4/ the tree and 4 days later you confirm it is a bird in the tree.