Which of these tanks is better in terms of… ?

Pharaoh (single), Ammit 25, Ammit Dual used as single coil, or Ammit dual V2 also used as single coil ?
I don't know what to pick. So I would like to know which of those 4, and only those 4, please don't suggest other tanks, as that confuses me, are better in liquid consumption, liquid capacity that would last me long and I don't have to refill it often, and decent cloud production ? And if Pharaoh is bad because it chugs <a href="http://www.vapininthecape.com/eliquid_c_7.html”>juice due to the coil, some people told me that, is it possible to…

<a href="https://www.planetofthe<a href="http://www.vapininthecape.com/eliquid_c_7.html”>vapes.co.uk/forums/ecig-discussion/everything-ecigs/threads/which-of-these-tanks-is-better-in-terms-of.149909/”>Which of these tanks is better in terms of… ?

Sweetner

Does anyone know where I can get a small bottle of sweeter to 'pep up' some of my ready mixed bought <a href="http://www.vapininthecape.com/eliquid_c_7.html”>juices that are a little sharp.
All I need is a tiny 10ml bottle so I can add a few drops now and again when needed. Buying a large bottle would be a waste.
Thanks.