I disagree. Cartos are what requires more work. You've got to fill and fill and fill, carry spares, make sure those are filled, and eventually you have to replace them which costs a lot more than replacing coils in a Clearo. They're almost impossible to clean one flavor out if you don't like it, and then there is the simple hassle of having to buy, fill, clean, and keep track of multiple cartos, often more than a dozen of them.
With a clearo you can fill it once a day and never touch it again. Once in a while you have to take off the top, remove the coil, and rinse them both off with warm water. I usually do this once a week and it takes less than 5 minutes. Other than that once a week cleaning all I have to do is remove the drip tip once a day and refill the tank with liquid, which takes less than 30 seconds. A coil lasts me around 2 months vaping 3ml per day, and replacing that takes no time at all as I do it while I perform my normal cleaning.
That said, cartos absolutely provide better flavor. The reason for this is because they vape at cooler temperatures by using a longer heating element that runs through the center of the carto. More liquid can touch the heating element at once, which means more vapor is produced at lower temperatures. The hotter the temperature the more of the flavor is burned off. Any Clearo user with a top-wick coil and a variable voltage battery can tell you that a real hot vape is almost flavorless.
Clearos tend to mute the flavor for that reason. The point where the juice is converted to vapor is much smaller so it has to be hotter to produce the same amount of vapor. The added temperature causes some of the flavoring to be broken down and burned off. With VV reducing the voltage increases the flavor, but reduces the amount of vapor.
That's why a lot of people now prefer bottom coil tanks, they allow more liquid to flow to the heating element at once which allows them to produce just as much vapor as a top wick clearo at a lower temperature, which provides a cooler vape and more flavor.
Cartotanks are the best, and worst of both worlds. All of the flavor of a Carto plus all of the holding capacity of a Clearo. Unfortunately, all of the hassle of cleaning a Carto and a Clearo at the same time, far more difficult to quickly change flavors, and more costly to maintain as well. Plus they have a tendency to leak more than a regular clearo.