The answer to the debate is to accept that each method has its advantages, understand what they are, and choose the one that fits you best.

I've been using both methods for more than two years, and bagged vapor is consistent, predictable, and easy to handle, hit wise.

A whip vape is inconsistent in its hits, but can provide big, smooth, lung expanding hits that are impossible to attain by hitting a bag, no matter how much vapor the bag contains.

Neither method is inherently more efficient or effective than the other, although it's easier to have efficiency with the bag. I find that most people who enjoy the vaping process and the taste of vapor end up preferring the whip, since vapor in a bag is, by design, more diluted. A lot of medical users, especially those with lung issues, prefer the bag though, since small, measured draws are much easier to attain.