I mean, there are a few differences that occurs with the change in airflow. It also depends on how you vape.
If youre using an RDA, the more airflow results in more vapor due to the added air carrying the vapor away from the coil. The problem with more airflow (especially witg high VG liquid) is that the liquid consumption of the coil will increase the likely hood of getting dry hits, resulting in burnt wicking. The vapor tends to be cooler and of course the draw is easier.
If you close off some of the airflow, you cut off some of the coils ability to produce vapor. I wouldnt say its a noticably different amount of vapor. I would say its usually more dense, as you have less air and the vapor is more "concentrated." The flavor production i find is usually more pronunced. The downsides of less airflow, is that the draw is harder, and its vapor tends to be warmer.