Black Gray

Black or Gray suit to federal law enforcement interview?

I'm not sure which to wear, I have an older black suit which doesn't fit me as well as this brand new darker gray suit I bought. The gray suit isn't exactly charcoal gray but is still darker gray and fits me much nicer, in my opinion, than the black. Which would be most beneficial though?

Better to look well put together than to wear the cliche black suit that doesn't fit well.

Tuxedo Eye Tutorial: Black, Gray, and White