@bowerock - technically I'm not sure if there's any real difference aside from, A) clothing issues and B) you will occasionally get a screen reflection or halo around the subject that'll be that screens color... so if you're background is a sky blue screen is better.. where as on a field, green screen would be better
- However in this case it comes down to, my friend got the material for real cheap. :D
so it's just what's on hand