Max, no problem. So I would say The tube was much more like hitting a Roor. I can?t recall exactly if you could fill it with water or not, but I remember taking dry vapes out of this thing and you really could milk a fat hit. The sphere could be more closely compared to hitting a whip type vape, except filtered through water. I guess the closest comparison would be using the SSV with one of the water filters. The sphere has more resistance when you are hitting it (kinda like the PD hit, but definitely not as much resistance, more like the resistance you get from a whip vape) whereas the tube is much more free flowing (if that makes any sense). The major reason why I went with the sphere is cause I tend to get zits around my mouth when sharing waterpipes with other people, so I got the sphere where I can put my mouth over the tube and just wipe it clean if I?m sharing. If my skin wasn?t so sensitive, I would choose?..BOTH! Just like anything else, it?s a matter of preference, the good thing is, you can?t go wrong with either