Best tanto fixed blade?

Guess that is not so easy to answer. What will be the purpose of the knife? I like the Tanto (reverse Tanto, if you will) of the Extrema Ratio Fulcrums, bayonets and Golems. Thick blades; 6.3 mm. Cobaltsteel (N690). Thats about as bombproof as you can get them, i guess. The blades are up to 18 cm long. But before you can decide on what is best i think you need to know what the knife is gonna be used for.