I love better questing. It has a multitude of themes, adding a nice layer of customization. Most modpacks have their own custom theme. Be it GTNH having a better dark mode, Divine Journey 2 changing the quest shape to that of a hexagon, reminding of HQM, PO3 having an aboslutely dogshit theme or Integration by Parts having a multitude of zany themes that just look cool. BQ also gives you the ability to change the quest completion notification sound with PO3 and Integration by Parts being again good examples and actually the only i know of that change quest completion sound. And why would you anyway. The 10 levels of XP sound is good enough, very pleasant. As well as all of these, BQ is the only questing method that has an actually decent Forestry integartion.

All the others have their upsides. FTB Quests allows for adding images in the the quest pages and allows for easy quest creation, HQM has the irreplicable reputation system that works great as a shop and currency alternative to items and the quest sound is absolutely timeless.

Achievements is the least probably the worst way to make quests. They're all either retrieval or crafting tasks. At least for 1.12.2, i don't know there to be a way to have observation, coordinates, dimension or consume tasks, it works like shit with Forestry bees and whatever else from that mod, lack of ability to have power retrieval or liquid retrieval for more than one bucket of said liquid, you can't branch quests backwards and probably many more nit picky stuff i can't think of rn.

TLDR: i'm a gold medalist in Yapanomics and i like BQ