when it comes to wind turbines, there are conflicting viewpoints as to which type is more efficient. It’s not about the way they spin; it’s about how much electricity is generated over the lifespan of a turbine, which can be as long as 30 years.
The main reason
vertical wind turbine are gaining popularity is basic eye appeal. People are more fascinated by vertical motion than horizontal, mainly because you don’t see generators operating in this direction as frequently as you do horizontal movement.
Another reason supporting vertical axis wind turbines is that the
horizontal wind turbine have a tail rudder that always moves to face the turbine into the wind. Depending on how the wind is blowing, this can be distracting or downright annoying.
or the Maillist 
which both remains active.
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