I'm still new, but so far it has been a mix.
In the morning it is either Cappuccino (Ms. T's Bakery) or Keoke Coffee (AmericaneLiquidStore.com). In the afternoon, I mix and match between Vanilla (AeLS), Champagne blends made at VaporGod or the Blackberry Champagne from AeLS, eJoker or RY4 from Backwoods Brew, or one of the coffees.
In the evening, that is when I experiment with my new flavors. If I could only pick one thing, it would likely be the Keoke Coffee for the flavor and the aroma.