iron & steel: F, in the end more useful than limited telekinesis, which would need at least some math, also I'm afraid of heights
Tin: F is just more versatile than A-Tin
Pewter: A, I know it's more dangerous, but it's also more versatile
Zinc & Brass: both A & F can be useful irl, a personal heater/cooler sounds nice, the ability to both slow down or speed up my thoughts also sound nice, but so does emotional manipulation, so I honestly can't choose!
Copper & bronze: irl F, Scadrial A
Cadmium: A, because I don't see myself needing F (esp with F-Gold)
Bendalloy: A is great (except that one does age while in accelerated time and I'm afraid that would add up). F is also nice, I love food. Most likely A
Gold: F, not even a competition, seriously why would I want A-Gold, sounds miserable
Electrum: determination is nice but limited precog is nicer
Chromium: playing with luck sounds dangerous... irl it would be the better choice because who'd I leech on Earth? On Scadrial... hmm... A-chromium would be better, maybe
Nicrosil: F sounds more useful
Aluminium: A because I don't like the idea of getting poisoned... or be less me, whatever that means
Duralumin: give my other A powers a boost or manipulate Connections, decisions decisions, let's go with F it would be helpful irl
Atium: Uh.... stretch lifespan or precognition??? I don't know!
Lerasium: haha! Now I have all the Allomantic powers, lol