Cinewhite will give you more accurate color in a controlled lighting situation. Cinegray would be better when ambient lighting can not be controlled completely.
S~
S~
I have two of the ezframes. One in cinewhite and one in cinegray. With a good projector and light control the cinewhite is the way to go.
Stewart costs a lot more but they have a really good product that blocks ambient light, but be aware that blocking the ambient light also cuts the viewing area down as off center viewing suffers. They also have the fancy screens that open and close and have automatic masking products.