I'm not a fan of the clearomizer tanks (vivi nova). They serve their purpose as being an easy tank system for beginners and experienced vapors alike, but like anything else they have their pro's and con's. And of course, people's choice in juice delivery devices are as subjective as are juice flavors. I find that the clearo tanks are lacking in providing full flavor of most e-liquids. I've proven this to myself vaping the same flavor in both a clearo and a cartotank. The cartotank won hands down in producing the best flavor.
Tanks in of themselves have little to do with actual flavor. They are merely large juice holders. The key component is what is the juice delivery method to the heating coils: ie. cartomizer or clearomizer. Each uses a different method of wicking the flavor to the heating coil. Cartomizers use polyfill. Clearomizers use string wicks.
Vaping primarily 95% with cartotanks, I use pyrex tanks from various manufacturers. My current favorites come from
IBTanked - Get Tanked With Us!. They are of high quality and inexpensive (< $20 each). I have one for nearly each of my current juice flavors, which makes it extremely easy and convenient to switch from one flavor to the next.
A key to satisfaction with cartotanks is finding a good quality, brand name cartomizer. I have been very happy using the single coil pre-punched cartos from Ikenvape (platinum series)
https://www.ikenvape.com/SearchResults.asp?Cat=1860 and Smoktek
Single Coil XL Tank Cartomizer for the SmokTank XL.
Proper technique used in priming the carto and the tank will help ensure success. I also recommend getting the tank accessory tool from Big Daddy Vapor called the Slap-Yo-Moma.
A PBusardo Review - Slap Yo Mama Multi-Purpose Adapter - Big Daddy Vapor - YouTube
The following video is the best demo that I have found that shows both carto filling and tank filling: