I love both colors but find the red fades out the blocks so maybe the blue if you want your blocks to be the showcase. Using the red as your border would be nice though. What I've been doing lately is adding a pinstripe about 1.5 - 2.0 wide about 1.0-2.0 in from the body of the quilt. Breaks up the border a little especially if using a solid. If I use a 2.0 pinstripe, then I split the border in at 1.5 so the 2 strips are not the exact width. Just a suggestion.