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With your WHM at 56, nearly 60, /SCH gets a nice stratagem boost (4 minute recharge pre 60, 2 minute recharge post 60) you’ll really make good use of it then.

In the end you’ll want all subs obviously, because everything is situational and you may need a different sub depending on what you’re doing. What comes to mind may be /SMN for Golden Salvage or to track the Imp NM in Red Baron Assault, or if you’re fighting Cactrot Rapido. /BLM for Warp is an obvious choice, along with Escape if you’re doing a lot of traveling, also Tractor is nice such as in Dyna (People really die in the worst places there), /RDM if you need Phalanx for tanking such as with the Blitzkrieg Assault…

Everything is situational. You’ll need all the subs eventually for one thing or another. But as far as exping/meriting goes… I’d go /SCH and I wouldn’t look back.