I personally think a log vape generates less smell than a LB. especially if you put the stems away in an airtight container/bag when not in use. The unit itself just smells like wood, and the stems are fairly easy to clean, whereas the LB will develop a bit of an odor after a while and is a bit limited on how well you can really clean it. Sure, you could just put the LB in a bag or something when not in use just as easily as you could the stems...
but the LB is capable of combustion and log vapes arent, as others have pointed out. so it will always have the potential to create WAY more of stink than a set temp vape, if you were to fuck up and leave the battery in or just hit it really really slow i guess.
whip/bag style vapes really seem to build up an odor after a while. smell gets in the tubing/bag quickly. so i'd recommend sticking with something with a short, direct air path, like the vapes mentioned.