Use jdupes to recursivelly search a directory for duplicates (symlinks also searched) then save results in a file.
jdupes -sr . > dups.txt
Go through the first group of duplicates (original and duplicate(s)) on the .txt
and open it with the default option that you have (so that you can compare both and choose if you want to delete one of them or not).
cat dups.txt | while read line; do if [ -z "$line" ]; then break; else xdg-open $line; fi; done