I think what TrollDragon was getting at was the defect rate. That's what retailers look at as to look at it any other way is pointless.
If on avg. you sell 100 smok mods a month 20 come back defective, that's a 20% defect rate.
If on avg. you sell 15 eleaf mods a month and 1 comes back defective, that's a 7% defect rate.
How much stock you carry of either mod or brand as opposed to the other has no bearing on the defect rate. If you sell only carry 10 smok units in a given month and you sell 5 every month, and you get 1 defect a month, that's still a 20% defect rate.
I have heard many times on various sites, from vape shop employees & owners, that smok has a high defect rate. And from my experience way back as a brief consumer of smok, I believe it. They may have good, solid products here and there, but all in all, probably a higher defect rate of all other popular brands.
That said, I do have a smok zMax v1 that's still kickin'