Dragon's Blood was my first jucie, and it is still one of my daily vapes. I would suggest staying away from the extra flavor and double flavor, having tried it all three ways, because for me (I know taste is subjective) the extra flavor and double flavor taste burnt. I have also tried it with sweetener added, and there was a very sugar water-y taste on the end, almost unvapable to me.
I have also tried Dragon's Tear, but since I am not fond of strawberry juices I did not like it, but for that reason alone. It does mimic Dragon's Blood nicely. I'm sure it would be great if I like strawberry juices (All the strawberry juices I have tried are too tart for me)