The Adventure modpack has the main mods across both like Slippery for slippery terrain, Hotbarlock Reborn so you lock your hotbar and don't drop things, Survive for thirst/other challenging elements and more.
Other mods included range from Storage Heaven's backpacks to Extended Bonemeals crop bonemealing support,
While focusing more on dungeons from Castle Dungeons & Dungeon and Artifacts, or additional structures from Vanillities.
Armor, Tools and Ores (regular, Nether & End) from Resource Overhaul, Aquatic Armors, Quiver Restoration, Hexxit Gear 2, Other Stone Pickaxe, weapons from Kaboom, Yet Another Gun mod and others.
There is also various mobs like Webbed Zombies, Rise of Arthropods Nether & End Spiders, or animals like Ostriches (Simple Ostriches), Camels, Croc mod's Crocodiles/Alligators, Aqua's Whales, Piranha and more, or Better Creatures fantasy and animal creatures that are both passive/hostile.
Along with the structures, mobs and gear there is a few biome and dimension mobs such as Sakura Forest, and Cavern: Miner, and building options like Construction Wand, Colored Lanterns or Cut and Colored..
Note: Please don't update these mods as they will provide the Fabric version.