I don't go by science on this one, I go by subjective experience.
based on years of subjective experience, and access to large quantities of the same strains, I can safely say that bongs get me the highest fastest.
joints have a less noticable high but it creeps up and is more enjoyable as a smoking method just for the sake of chillin and smoking.
pipes have a little bit more abrupt of a high than joints, but much more subtle than a bong.
all these methods truly depend on your tolerance, but my medium-range tolerance bongs get me the highest. most likely because you're getting a lot more thc in the hit even if it 'supposidly' isn't as efficient, you're getting higher hit per hit than any other smoking method.
so that's my 2c. on this subject... had a lot of time to figure this out.
forgot to say my piece about vapes....
for those whos lungs handle them perfectly (unlike mine) it will be a very enjoyable long drawn out experience. it doesn't get you as high in the same way as bongs, but it does give you a stronger head high that appears to last a little bit longer. I don't see this method as that much more efficient because if your tolerance is low enough, 3 hits out of a zong will fuck your world up. 3 hits out of a vape on a low tolerance will give you a VERY nice head high but you wont be fucked up like you would out of a zong or bong.
and I don't attribute this effect to toxins in the smoke, I think that's a bunch of bullshit. there are lots of cannabinoids the vaporizer cannot extract, hence how many people make cannabutter out of their leftovers, because there is plenty of cannabinoids left over. with smoking, there is no such cannabinoids missed such as CBD that vaporizes at atleast 20 degrees higher than thc.