I can suggest only R2modman as i never tried anything else. It works fine and we never had any issues with it. Our current modpack is Valkans and we update it regularly according to our needs/likes to the game process. It has Jewel crafting, creature level and loot control (currently limited to 3star mobs), several building mods, skill mod for sailing, honey+ for a bit better foods (thinking about adding potions plus too) and some other QoL mods. I wouldn’t recommend any new biomes mods as they just aren’t fun and require a lot of balancing with extra mods.
What i would recommend is to use pre-made world. We finished The Olde Road and are currently playing A Shattered World. These worlds can be found on nexus. They are fun, check the description on nexus and see if you would like it.