For me in sunny Utah, Granada shows more red in the flower with age. It begins with the orange/golds and red edging as shown in many photos, but as the bloom is exposed to more sunlight, the red begins to dominate the color mixture (this happens with Double Delight also.)

As for the foliage, Granada is not glossy, it is matte green all the way. Also, remember that Granada is really only winter hardy down to zone 7. You will need to protect it if you live in a colder area, or have an own-root plant that will come back after freezing to the ground. Distant Thunder is hardy down to about zone 6 without protection.

The bush heights are about the same in my garden. My Distant Thunder hasn't gotten over 4' yet, nor has Granada. However, zone, site location, and fertilization could alter this for either rose. Good luck. Both are beautiful, and nicely scented roses.