The Vivi Nova is good if a bit fiddly and requires tilting to keep the wicks well saturated, no biggie. Carto tanks are as good as the carto used in them basically. I prefer Ikenvape single coil cartos in tanks. In a tanks a carto has holes to allow juice to keep the filler wet, in some dual coil cartos the holes are below the top coil and it can get a bit dry in heavy
vaping result in a semi dry or harsh hit. A single coil at the bottom of a carto doesn't have that problem especially if you punch your own cartos with slightly larger holes than the factory pre-punched cartos.
When it comes to tanks themselves I prefer glass over plastic and grommets over the standard caps and o-rings.
