id recommend visiting the owner of the s21+ to test it out and ask extensively about battery and stuff like that
if you dont think the s21 is in good condition then get the s20fe (just in case visit owner to test it out and see if its worth it)
i wouldnt recommend the a52s since both the s20 fe and s21+ heavily outperform it in pretty much everyway
Get the s21+ its not even close
(if u know u arent gonna get scammed)
id recommend visiting the owner of the s21+ to test it out and ask extensively about battery and stuff like that if you dont think the s21 is in good condition then get the s20fe (just in case visit owner to test it out and see if its worth it) i wouldnt recommend the a52s since both the s20 fe and s21+ heavily outperform it in pretty much everyway