neither - what i do is its really easy and fast to make 4 socket (any high level armor) ebug on lod. i usually make stone then hel + tp to remake fort since i already have base armor. another good option since i usually find a 3 socket crap base armor is treachery it only costs a lem rune and i consider these junk runes.
as for "temp" armors almost anything will do hes happy with anything with defense then res so..
arkaines valor
black hides
corpsemourn
duriels shell
iceblink - he freezes stuff thats useful
leviathan - solid temp
grey form
guardian angel
shaftstop ++ very solid
rockfleece again very useful as temp
skullders ire - eth or non eth it has defense
gladiators baine
toothrow
always look for does it have defense? could it have any res of any kind, could it have life?
basically fort is #1 merc armor and look for similar stats