I can say from experience; as JP is saying, a direct atty to batt connection does have less voltage drop (hit harder).
& it makes sense too right, there is nothing that is going to be more conductive than actually connecting the atty's 510 positive pin straight to the battery. Even a chunk on gold between to two.
^So that is the Pro.
The Cons are: Mod has to now adjust for battery rattle w/ button, or by telescoping the tube (ewwh). Usually low v-drop mods are used for dripping; in the case of overdripping (which we all do)
juice can get in the TC & tube, leads to more frequent cleaning & occasionally TC can get 'stuck' in the tube which you'll need drill bit(s) or a tool to remove if modder smartly included a feature like two holes to remove TC. And probably the biggest con is safety; the atty's 510 pin must protrude. Also for some reason there are still some mods that do not have a insulated hybrid TC (in this case if you take the atty off w/o removing the batt first you can have a hard short).
Cons are really not that bad as long as Mod was designed properly.
& silver, gold, whatever, as long as the button is designed to also take a high current draw direct battery contact is the way to go if you're looking for big clouds & a hard hitting mod.
Regarding the top connection, it ain't gonna get more conductive than that.
-PS credit to BCV for doing it first.