i dont think you should do medium dark at all. med plus would be your best bet. im nc40 in select tint right now, nc35 in winter and medium dark is too dark to use all over for me.
i bought medium and medium dark and find myself going for medium dark most of the time but i think my skins slightly darker than yours so to be safe i agree..i would go with medium plus!
ok medium if u want a natural look, or medium dark if u want a SLIGHTLY bronzey look, many MAC ma's seem to do this on the counter near me? - they have a nice bronzing effect! - im NC41.. n wear medium deep..
I am NW20 and the MAC MA gave me medium but its too dark for me. So next time i'm getting light medium. I would not go darker than medium plus if I were you.