If you’re looking for outside opinions E4 has plenty of threads about favorite sets:
Favorite WOTC sets:
www.elitefourum.com/t/what-is-your-favorite-wotc-set-poll/26123/1
Favorite EX Era sets:
www.elitefourum.com/t/what-is-your-favorite-ex-nintendo-set-poll/26297/1
Favorite set overall:
www.elitefourum.com/t/favorite-eng-pokemon-set-one-pick-only-no-other-words-please/18905/1
There are my many more by just searching favorite set here on the forum. Good luck with the list.