For me the Vivape/Cloud comparison is sorta like comparing apples to oranges. Actually it is like comparing fruit to candy. Both are sweet, but I have grown out of candy and prefer eating fruit whenever possible.
Now, onto which vaporizer is the 'fruit' and which is the 'candy'.
Well, my tastes have evolved to the point of nearly demanding a air-path free of ceramic heaters or heating coils, and striving to eliminate tubing and other parts that can not be cleaned thoroughly/safely (like glass). This is connected to both material-safety and unwanted flavor accumulation (who here still uses plastic waterpipes? Why not? Why has vaporizer tubing remained when we have generally moved on to glass for water pipes?).
These differences make the Cloud the clear winner over the ViVape IMO.
However, I also feel that the vapor production comparison between the two units is like comparing "candy to fruit".
I have used both, and the Cloud's vapor is way thicker and tastier IME.
The Vivape has a lot of bells & whistles (touch screen, lights, etc), which may garner some attention from passing expo attendees. Opinions/preferences vary greatly too. Many at the Kush expo seemed to be in the neanderthal mindset that smoking/dabbing is the only way to go.
However, I can't recall anyone coming to hang out and asking me to take out the Vivape instead of the Cloud.
IMO, the Cloud is king (without any doubt in my mind).
I am going to kick back with a delicious 'mango'. Enjoy your 'gummy bears' if that is what you prefer.
Toke it easy, all!