I generally have a dozen pyrex IBTanked cartotanks and a couple of AGA T2 rebuildables going at a time, each with their own flavors. I typically switch out to a different flavor 3 - 4 times a day. Variety is the spice of life!
AGA #1:
Currently I'm using either Dripeez's Golden Apple, either straight or with a little of Cinnamon or Rum flavoring added; or some homemade DIY unflavored with the same flavorings from concentrates. This is the closest that I come to an all day vape and I dedicate this AGA to it.
AGA #2:
Copper Creek's Coffee, or one of my many other coffee flavors from Dripeez, Virgin Vapor, or Vaperite. The different coffee flavors get changed out to another one for each tank refill.
Kona Velvet Milkshake, Kona Cream, and Double Espresso are favorites.
Cartotanks:
Fruit, coffee, red hot cinnamon or spicy cinnamon, vanilla, or an Ice Menthol from the above 3 vendors.
The fruit flavors include Pear, Passionfruit, Grape, Watermelon, Kiwi, Lemon-Lime, and Papaya. Unfortunately, I've not found a Mango, Strawberry, Blueberry, or Pinapple that I care for.