i personally prefer the old red because it is darker, the deeper (sulci) bits do have that greyish tinge and the higher points (gyri) are lighter. while the new one has more orange in it. i'll try to take a photo of these two in different lights and angles when i get home
ITA!
it's funny, i took my old red epi pochette to repair today and my SA put it next to the new red to compare. the old red is simply TDF, extremely rich in color and depth. it also has the black glazed edges whereas the new one was just red. not sure if this is on all the styles but on the pochette it was.
ultimately, it's your personal preference and you choose what's best for you. as deluxeduck said, the new one has more orange tones in it.
good luck!