Hemalurgy, so long as I could start off with increased lifespan, the ability to store health since there will be spikes in me and basic knowledge of hemalurgy.
That way I just need to wait till everyone else is on death's door, then take what you no longer need. With permission of course if you're still lucid.
One major plus would be bestowing long life on my cat.
Otherwise Feruchemy since it's simply practical and awakening is too obvious.