Well, when I first stopped, It was whatever flavor Niccotek had... when I siwtched to CE4's/Ego batteries, it went to RY4. With my RBA tank, I've seemed to settle on a particular method (I have mentioned this in a previous post)... I take my one tank, and fill it with Guava. When it gets down to half to 1/4th, I refill it with Bananna... when that gets down to 1/2 - 1/4th, I put in some strawberries, etc.... the taste always seems fresh that way and is never the exact same day after day. I usually order 3 50ml bottles of a fruit mixture and mix them. Since I vape a low niccotine content, I get all my mixtures the same setup: 65pg/35vg/6mg Nic. Guava seems to be a very good rotation in the fruit mix, so I always order at least one bottle almost every time.
Almost out of guava/bananna/strawberry, so my next order is green apple/guava/Demon energy. The only wildcard in my new order is the green apple. I have never tasted it before, so I'm taking a gamble. If worse comes to worse, I know demon energy and guava can be mixed together and taste good.