The five criteria aren't equal for every customer. A first-time vaper cares more about ease of use and flavor clarity; a heavy user prioritizes battery life and consistency. Availability is always a factor, but it's more of a constraint than a preference. As a rule of thumb, weigh consistency at 30%, ease of use at 20%, flavor clarity at 20%, battery life at 20%, and availability at 10%. That's a starting point—adjust based on your store's customer mix. The point is to have a deliberate framework so you're not just pushing whatever's newest.