I would mix them, I think variety adds more color in life, so it definitely applies here...<br />
actually, no, what do they say?
They would be red for passion, my wife is far from innocent to get white roses (one of the reasons I married her )
1 red 1 white and 1 with both red and white. red for the love, white for how pure it is, and the mixed one to symbolize how harmonious it can be <3... (im such a love dork)
Both red and white to show their significance.
Red...white means the end of the relationship