Don't know if I have the best answer, but I certain have an answer. Buy both! There is no clear cut winner between the 2 cartomizers. It really comes down to personal preference.
Wow Cartos are LR so they vape a little hotter, produce a little more vapor on batteries. Premium Cool Carts vape a little cooler, work well with batteries and are preferred between the types for higher voltage devices like Mods or Passthroughs.
Only you can determine which is best by vaping on both. Cool Carts are 1/16th of an inch longer so they can hold 4 maybe 5 drops more of e-liquid and are a little friendlier on the lips since they don't get as hot.
I use both......
Here is a video on refilling using the Drip Style Method...there is no sound..a video is worth a 1,000 words blah blah blah. If you have a .... plug condom I'd put it on the Carto, as well look down the air tube hole just to make sure it doesn't have any juice after refilling.
If it does, now worries, simply push in the sides of the bottle, turn the carto mouth piece end down and stick the dropper in the hole, release the bottle a little, the vacuum created will suck an excess juice right back into the bottle. Just stay away from anything to do with Condom Method of refilling.
Drip Style Refilling
YouTube - Refilling Vapor4Life Cartomizers
Syringe Style of Refilling
YouTube - Syringe Method for Refilling Cartomizers
Why the Condom Style doesn't work....
YouTube - How Many Drops in 1 ML Condom Method Sucks
Let us know how it all works out, hope this helps!
