There is no permanent ONE. I have a "one" for now, but it's not the same "one" that I had a couple of months ago. When I started I got a sampler with about 10 different cigarette flavored dekang juices in it... they were ...meh. But the vendor threw in some grape and that was pretty good, but not an all day vape. I also got some root beer and pepsi... meh.
After a month or so I got some stuff that the members seemed to be loving: Pralines & cream, cappuccino, peaches and cream ...meh.
Atomic cinnacide... YES!!! and then it made me lose my voice (froze my vocal cords, I think), I still vaped it for about a week anyway even though I was completely mute the entire time but I finally had to give it up because it became an inconvenience to not be able to speak. hehehe, my voice did come back and I still eyeball the remaining juice that's left in the bottle.
So then I tried TW totally wicked menthol flavoring for DIY: Love that stuff, it'll kick your ask if you like serious throat hit. I also got a sampler of fruity flavors like grape, strawberry, apple.. just the basics ... meh. BUT, I discovered that fruits and menthols go together so I modified all my fruits to be fruit/menthol ... yummy! I also got 555 and ry4. 555 became my "one" for quite a while.
Then I got Wyatt Earp, pear, banana, pineapple, and a bunch of that type. Wyatt earp is my "one" right now, with pear as my palate cleanser.