I'm definitely in the feruchemy camp for my current real life settings. I work and office job, 40 hours sitting and doing easy easy work that requires very little focus or thought. Ideal for storing any sensory attribute, speed, mental speed, even health. I could stand to feel crappy for a while just sitting at a desk in exchange for more health later. Also storing a lot of health would be a convincing way to get a day off if you really needed.
Storing weight would also be less disorienting while sitting as would speed, though my typing would suffer. My job requires no strength at all so that's a check. With my shift being 8pm-6am wakefulness storage would be a great way to sleep on those annoyingly bright days and I could tap it on especially slow shifts to avoid falling asleep mid-call (yes I've done that).
Now bendalloy is extremely appealing to me. I find eating on a regular basis to be very tedious and I just don't care for it. I would love to have one daily feast of all my required calories and then be done with it, bendalloy on a slow tap throughout the day as needed. It's like a dream come true for me.
So yeah. Feruchemy is my jam.