I switched from subs to dubs (whenever the option is available) years ago and a this point I couldn't tell you there's any difference in "quality", it's just a different way of watching the show, do you want to watch a show where people speak like cartoon characters but you don't recognize it because you don't speak the language and also you gotta read subtitles or do you want to watch a show where people speak like cartoon characters and you can recognize it because you speak english and it will be cringe until it's not anymore.

Anyway Delicious in Dungeon was really good, Frieren I didn't watch but I saw that they gave her a deep voice in the dub and that's 10000% better than a young sounding voice for that character. Cowboy Bebop is famous for it's superior dub. If you liked Dragon Ball you can pick one of the modern Fight/Battle animes like Demon Slayer, JJK or Mha.

There's "March comes in like a lion" which is a drama about a kid who plays Shogi, which also has a great dub