the only way you can ever compare a blunt to a bong is with shotguns....those hits can be huge and they definately leave u on ur ass for a bit...

gravity bongs, lungs, and waterfall bongs are all best for weed conservation because they get u fucked in 1-2 hits..(most people)

vaporizers are probably best...never tried a digital vaporizer although I hear they are a very great investment....supposedly the best way to conserve weed and stay high the longest