As I said in #tmk...
I use white when I eat peanut butter sandwiches. And when I say "sandwiches", I mean taking just one slice of white bread, and smearing chunky peanut butter all over one side, and eat it like that. No other slice to close it, no jelly (IMO, jelly is disgusting).
I use wheat when making turkey sandwiches. Wheat goes better with turkey, I guess....