Volcano Vaporizer -- Easy Valve vs. Solid Valve?

I'm going to get a Volcano Vaporizer but am unsure whether or not to get the Easy Valve system or the Solid Valve system.

Which do you prefer and why?

 

I prefer the solid valve because I was recommended one by a guy from the novelty shop and it is actually very easy to use. The novelty shop guy showed me a demonstration of both easy valve and solid valve and solid valve is less difficult to use. Infact, it is more easier to use than easy valve.