Navy. Add cream if you are doing flower or something in those small blocks. Navy would look good on that background fabric but with the number of blocks, it would drag the tone of the quilt too low. I would only use red is you are one heck of a quilter as your handiwork will show up.
If you got it, flaunt it, if not, play it safe with navy.

tim in san jose

I am thinking you are planning an E2E design using your pantovision. I really don't like either color for that application but if I only had a choice between the two it would be the navy. If you can expand your color choices, I would choose a soft camel tan color. More in keeping with the fabric and the quilting will not be "in your face". The red would be "in your face" and in my mind too contemporary given the fabric selections which seem more traditional like CW repro or country folkart (like thimbleberries type lines).

I like the possibilities with the red, but you have to be careful so it doesn't overpower....I also like the idea of the navy in an edge to edge design.

I would go with the navy.

Definitely not red. Agree with the above suggestion that stated if using panto's to go with a camel/beige/tan tone, but navy could work also. If not doing edge-to-edge, i'd choose the navy and a soft cream for the small print too.

Given the two, navy. But I think a tan would harmonize with both and be subtle.

I plan to do an E2E panto, so tan is definitely a possibly. That's why I love to post questions. Y'all think of things that I don't.

Tan was my first thought as well for E2E. Navy if doing SITD.

I would use blue...

Definitely the red, so the quilting shows up.