Cheap, easy to work with, massive range of flavours, don't fade generally. I've tested all the VBICs side by side and TFA's beats everything else by a country mile imo - even Hangsen's FVIC. Generally, I would say that TFA's creams and dairies (VBIC, VBG, Sweet Cream, Dairy/Milk, Vanilla Swirl, Bavarian, Whipped) are the best overall range. If I could only use one brand of creams/dairies, it'd be TFA. They do have some duds like Honey, their coffees, Guava, Cheesecake, etc, but all lines do.
What I don't like about LB and VT is that they are horribly over-priced for the weakness of their formulations. Flv strays into that territory too with some flavours. TFA can also be quite weak but they're 2/3 the price of LB, half the price of VT, and a quarter the price of Flv. At least, around these parts. So it's an easy decision for me.