dripper and
tanks are different..or are you talking about RDTAs?
i've only had experience with Bellus and ARomamizer rdta.
i read about mutation rdta which is good too but it's hard to find around the region
you can't go wrong with either bellus or aromamizer, great flavour, great clouds, IMO bellus has better flavour over the aromamizer but i prefer to use the aromamizer overall.
buy either one only if u already know how to make your own coils AND have confidence in wicking as they will leak if you are unsure how to do it right
alternatively can watch any guides on youtube
Bellus Pros
Top Fill, Single Coil Adapater provided, one of the best flavours out of any tank
Bellus Cons
Small Build Deck, Post is tricky to build on as there's only 2 posts with 1 hole on each side, cheese grater air flow control (don't like the pattern)
A.RDTA Pros
2 post velocity deck is very easy to build on, easier to take out the deck , better airflow
(bellus u have to twist the ring, then pull out. here u just have to twist the base and the deck comes out)
Cons
the part where u put ur drip tips sticks out, gets real hot if u chain vape, bottom fill, air flow control rubber band