OK, I'm literally flipping a coin on this.

I'm getting ready to paint the Akula's lower hull, should I paint it red or dark gray?
The kit says hull red but gray would also look tasty..
I built their 1/350th scale 688 a couple of years ago. Great kit, its the one 688 that gets the hull and bow dome right. I was torn between painting it like "good old usta fish", the 698 (which would have been a pain to mask) or a San Diego boat and wound up doing a replica from SC/DW.
So, what do you think?