For flavour single coil I'd go serpent,for dual coil ,reload,dead rabbit and creed,I've just got the creed and loving it.
The creed comes with 3.5 ml tank and a bubble tank takes it to 6ml,I did say in my post that it's not leaking but it is a little bit,need to get the wick and vacuum sorted ,it's tricky to build cause it's two single posts.
I watched vids for it but best to do one coil and take it out to match the other,so smooth vape and flavour is top,if you get it from China it only comes with one air cap but to be honest it's airy enough with the blank cap supplied,when I sort this leaking out I think it's a tank I'll use on a regular basis