dGSM has Gold Spectacles, Darklight or Mythology drops, Allagan jewelry and the Break Blade. But it has the most competition. The only useful myth token is the head piece, and don't think any Syrcus or Labyrinth drops work.

dARM has the most options in Allagan gear, can use all nearly myth tokens, and can craft arm belts. The Onion Shield, but that helps only if you run EX primals religiously. There are a good number of Syrcus and Labyrinth options.

dWVR has many Allagan options, mostly in turn 4, can use some myth tokens. It does not have a crafted belt option, so you'll need a minimum of two Tawny per desynth attempt. There are some Syrcus and Labyrinth options.

dLTW has a few Allagan options, can use most myth tokens, and can craft belts. There are a number of Syrcus and Labyrinth options.

dBSM is not a good choice. Farming Ifrit, Garuda, and Mog as a tank are your only really repeatable options, but even if you're farming light it's a miserable use of time.