Ive been vaping TC SS for a while on a variety of wires on a wide variety of set ups for quite a while,Im fortunate to work a vape shop
What are we after from in a vape? the healthiest possible without actually quitting,or the most satisfying-whatever that may be,lol...?
MODS-
The joytech is not very accurate & harsh but easy to use,sx ml class is accurate (or at least consistent with other devices) easy to use but a bit harsh, the DNA200 is accurate smooth but cuts out a bit strongly & is a tad too sensitive & finicky,the Dicodes is my preference so far (26650 mod,called No.??) a tricky sod to suss initially,but accurate & very smooth with undetectable throttling off.
wires
Easiest is 304,because its the most mass produced Chinese wire so comes by default is the wire the majority of these chips/boards were built using. 316/7/L are much the same,not particularly more durable or better than anything else.
430 (Ni free) seems ok so far but like everything can be awkward to get dialed in,& health benefits over other metals could be questionable anyway.
Personally I think the "safest" is probably TC ceramic coils,with whatever metal is the most accurate & durable at its core. Ive only tries a few puffs on a customers altus,& it vaped nicely but needed lots of battery sapping power & had aeons of ramp up. Ive not jumped on board yet as i use drippers pretty much exclusively 'coz I pg intollerent (chickenpox buggered my allergy system in 2013- wheat,gluten,PG,carrots,dairy etc,lol) though i dont class myself as a cloud chaser,i am a lung hitter at around 200*C
This is only my experience,YMMV ;-)