I haven't used the inferno one. I'm a bit concerned they have it listed as 1.5 ohms but then on the site in the description they say its 2.0 ohms.
The Mad Vapes one is cheaper, and you'll need a few. Also Discount Vapers has a good deal on these:
510 Bridgeless Atomizer - 2.0 ohm
If the flavors are similar I just change the flavor. You only need to put a few drops in. But they will need cleaning. Rinse them with hot water, then leave them to dry. When dry, do a dry burn.Dry burning is putting on the ego, firing the button for a few seconds, then resting it for a few seconds. You will see a bit of vapor coming out - that's the gunk burning off. When the coil glows red completely you stop.
Here's a video on dry burning an atty:
I don't recommend clearomizers like the CE3 for drip testing. I've found they often leak after cleaning, and are not worth the hassle. An atty is easier.
You might want to pick up some 510 drip tips too.