What is your favorite QOL / balance mod?

It will not work the way you’ve posted it (the > in it will mess it up, and depending on the game’s version the "obsolete": false will still result in it being considered obsolete).

The correct version (as I’ve posted before) would be:

[
  {
    "type": "MOD_INFO",
    "id": "no_reviving_zombies",
    "name": "Prevent Zombie Revivication",
    "description": "Disables zombie revival.",
    "category": "rebalance",
    "dependencies": [ "dda" ]
  },
  {
    "type": "monster_adjustment",
    "species": "ZOMBIE",
    "flag": { "name": "REVIVES", "value": false }
  }
]

I usually play it with only the default mods active (bionic professions even though I only used them once, and No NPC Needs), sometimes even without them.
However, I do change stuff up with the settings. Usually I set the item spawn rate higher (as most houses feel a bit empty), make the monsters slower but more resilient and sometimes drop the construction time down.