Hope this helps, but this is based on the experiences of only myself and my friends:

1. A vape high calmer is than a smoke high. It's subtle, but definitely present. It's like it affect my body more than it affects my brain. A smoke high makes me obviously high, giving me a clouded head. Smoke high is more fun in my opinion, while vape high is more relaxing.

2. You certainly will. You can even use the remnants in a bowl (supposedly) or in edibles (which I've done). You can stretch it out more since you get more bang for your buck, and not all of it is going up in flames, which can result in wasted smoke if you can't handle the hit. Though, as I said, while you can use more, its not as fun as a smoke high.

3. I've never used the volcano, just the Magic Flight Launch Box and the Vapor Genie (both the glass and wood looking one). I like the high from the Vapor Genie more than the Magic Flight Launch Box considerably, though the Vapor Genie is (in my opinion) a little harder to use, and the MFLB is much easier to transport and conceal, which is a plus. Also, MFLB doesn't require any open flame. I like to bring MFLB with me to movies, and it never gets noticed.