Suppose you want a device that's even smaller for your commute, but you also want enough power for a satisfying draw. That's a trade-off. You might pick a device with a smaller battery but a top-fill tank, so you can refill quickly. Or you might go for a pod system that's ultra-compact, even if it means more frequent refills. The point is to weigh what matters more: size or performance. For desk carry, I'd lean toward size—since you're not hiking with it, just moving from backpack to desk.