It all depends on whether you're a beginner or not. For beginners, you should choose a clearomizer for indirect inhalation, which will reproduce the inhalation of a cigarette and be able to withstand high nicotine strength. After a while, with a lower nicotine strength, you can switch to a direct-type clearomizer, which will produce more vapor. It's all a question of taste, as many vapers will stick with an indirect inhalation.