My personal experience - the Vision vivi novas (have both the mini and the regular) give the truest flavor, once you find the right voltage. I have several of the atomizer heads that are marked 1.8ohms, but I think they are probably higher than what is marked. I have to turn them up higher (voltage) than my other 1.8 ohm clearos - if I leave them around 3.7V (where I'd normally vape 1.8ohms) then the flavor is more muted.
I just got in two DV-brand (discount vapers) mini nova-style clearos. Only about 24 hours in, but they seem to be just as good as the Vision brand - except they come with a metal (non-removable) tip and a skirt to cover the eGo's cone threads. Great flavor on these too, and much easier to change out the heads (unlike the Vision, you don't have to pour out the juice - you can remove it from the top), and they are a nice warm vape...which is probably my only gripe about the kanger T3. They have a good flavor to me, but certain flavors I'd prefer a warmer vape than what they give.