Right now I have 2 for different setups:
For higher watts (RTA and sub-ohm tank): 70/30 vg/pg wild strawberry (9mg), freebase.
That one I mixed myself (using "Franco's Flavours" Wild Strawberry concentrate)
MTL: UK made, 50/50, 18mg nic, freebase.
Black Tobacco (aimed to resemble tobacco and liquorice papers) made by company called Elite. I tried nearly all tobacco juices they make, it's really funny because I didn't really like others too much, some weren't too bad but didn't blow me away, but this one I love for some reason.
Usually I vape something sweet and fruity: like strawberry, strawberry+cream, grape, pineapple, lemon, multi-fruit mixes etc. but at some point I just get to a stage when I'm tired of fruity and sweet flavors, then I switch to tobacco flavors, or something like heisenberg for some time.