I think it just depends on the era of the GT40 which one wants to emulate - if that's what you're after. The Heritage signifies the era after Ford left the racing program, and John Wyer got approval to carry on privately. He got the Gulf sponsorship and raced the cars for 2 more years, winning Le Mans both years with GT40/P1075 - a remarkable feat. If you want to emulate the original 1964 GT40's, you would prefer a Centennial White car with Blue Stripes. Or, if you wish to look like the original Le Mans winning car of Bruce McLaren in 1966, you'll want a Mark II Black with White Stripes (or were they silver?). Then again, the Le Mans winning 1967 Mark IV GT40 of Dan Gurney and AJ Foyt was, of course, Mark IV Red with White stripes. I think Andretti's car at Sebring was Speed Yellow with Black Stripes.
So - pick the color of your favorite winner and have fun with it!! - Me, I knew Dan a long time ago for a little while, and still wish I could drive half as well as he did.
:cheers