Cartomizers are an easy fix....if juice is coming out the end of the cartomizers, just hold a tissue at the battery end of the cartomizer and blow gently through....also allow enough time for the polyfil to absorb the juice....if the cartomizer is new, I fill with around 30 drops or so(when it looks like a slushy) and allow it to set around 10 minutes or so.......gently blow holding a tissue and then put it on the battery and vape....give it a try.
Clearomizers are good for vapor and taste but definetly have a learning curve to them....The trick to them is to make sure the wicking is not pinched too much cutting of the flow of juice....if it is pinched too much it will have a horrible burnt taste to the juice.....
box mods are good too. They have all kinds of sizes, so you can have a hugh selection......
hope some of this helps.