I've used all of them except padded. I can't even see a use for padded unless your Dexterity modifier is +8 and you can't contemplate it ever going up. Leather I use when playing barbarians, bards, rangers, and rogue at 1st level, I then upgrade to mw studded leather as soon as I can afford it. For rogues and rangers, my last upgrade is to mithral chain shirt. For barbarians I usually go with mithral breastplate to keep my fast speed. For bards, I might go either mithral chain mail or mithral breastplate, but it makes little difference unless I have a lot of Dex-based skills (which I usually do not with bards). When playing cleric, fighters and paladins, I normally start with scale mail at 1st level, then upgrade to chain mail as soon as I can. Since I don't care about ACP with such characters, I typically avoid splurging for breastplate. My last upgrade is usually mithral plate, although on occassion I have upgraded to banded mail, splint mail, or half-plate in between. I rarely wear full plate unless it is mithral. I figure if I'm gonna spend 1,500 base cost for armor, it better be great armor.