
...First, how much do you smoke per day? Second, what do you smoke? Third, start with the juice...Last, the unit(s).
2 keys for success: Reliable correct hardware to fit your needs and great juice. Period.
My opinion is you do NOT need a VV (Variable Voltage) for a great vape. I use a 900mah ego ( 4.2v off charger/3.2 V weak) and a mini evod 1.8ohm coil and I get 5-8 watts all day long. My problem with VV's is that often they are not accurate. I mean, look what you're paying for supposed "accurate" voltage? Not much. Often burned juice. If you're lucky and get close to accurate, it's a win.
So..once you've found your need for battery use all day long (Want to have enough), my recommendation is a high quality ego (look for brassy color at battery connector and thread quality and weight). There are some baaaad copies of everything out there. And I like the bottom feeders for the 510 thread. Kangers are my choice. Vivi's for top feeders. JMHO..Good luck man!
Oh and ...personally, I don't do carty's..I don't want to inhale the "fill" they use for wicking. Clearos are my choice, silica. 99% comes from China. Peace.
My unit: ego900mah and mini evod 1.8 ohm. Winboro Lights (14mg) Koolport Ice (14mg) Vape on!
