B, definitely.
Because girth rules in sex.
Yes, I’ve read the threads about greater length allowing you to reach new horizons and locations in vaginas, but having been 6 L, Pre-PE, I can tell you for sure that I have managed to get to most of those places at “only” 6, depending on the sexual position.
On the other hand, so to say, larger girth increases pleasure for both partners. The male achieves more friction within the vagina; the female does also, with more and easier (on the male) pressure against her clitoris. If there is indeed a “G spot,” 6 inches L, or less, will reach it. With girth filling the space, though, by its sheer volume, chances are increased to bring a woman to orgasm.
Works the other way around, too. I have only gay sex nowadays; girth rules there, as well. The only negative is that being 6.25 G makes blow jobs dicey sometimes.
But, you know? It’s good that we don’t just have the three choices you offer, coming to PE in so many size configurations as we do with potential for many others if we work at it.