That is a tough call. I think both colors are stunning - especially in the First. If I had to pick one over the other I'd go with Grenat just because I absolutely am ga-ga over that color. I have a Grenat First and it's like a glass of wine you want to savor for hours.
YUMMY!!!
If a rare pumpkin First came up for sale on
ebay (as it is right now) I'd get it just because it isn't made any longer and Grenat is much more readily available in every style.
Guess I wasn't much help. Sorry.