Don’t forget to add your reasons why you like them
Anyway, my best modpack for expert players would probably be DDSS, as it takes a lot of experience to handle, but is honestly an enjoyable pack for me. You have to work for everything, but as long as you’re used to expert style packs, it’s never too much grind.
My most original, and probably most interesting as well, favorite modpack would probably be Ultimate Alchemy. It’s a really unique take on a skyblock, with no hunger and creative flight from the start. There was literally never any grind in my entire playthrough of that pack, and it takes a lot of classic mods and flips them on their heads.
I haven’t finished a ton of modpacks, so I can’t say that those are the best of every one ever made, but I think that Ultimate Alchemy wins between the two for my favorite pack in general.