Well, I may be a little late to the conversation, but I do have a Vamo and a Lavatube v2 Lambo.
Both are good little devices, to be sure. They're both well made, work, decent electronics.
The Vamo is my favorite. It's heavy, and stainless steel. It looks like it is indestructible. The Lavatube (Yung Joon model) is chrome plated aluminum. It is light weight but, feels flimsy to me. It may be better if you get the Lavatube in stainless. It may feel sturdier. I just would not recommend chromed aluminum...it just feels nasty when your hand gets sweaty. The stainless on the Vamo feels nice to the touch. The Vamo also allows the trustfire 18650 battery which is slightly longer but goes to 300 mAh. That battery can hold a long charge. The Lavatube only allows standard size 18650 batteries. The other problem is that the battery indicator on it is wrong. It indicates little battery life left, but there's still a charge there.
If it were me, and I could only choose one, Vamo.