The Edge has 10.4 cubic feet more passenger volume than the RDX (113.9 vs. 103.5).
The Edge has 1.5 inches more front headroom, .6 inches more front legroom, .2 inches more front hip room, 1.6 inches more front shoulder room, 2.2 inches more rear headroom, 2.3 inches more rear legroom, 3.7 inches more rear hip room and 3.3 inches more rear shoulder room than the RDX.
For enhanced passenger comfort on long trips the Edge’s rear seats recline. The RDX’s rear seats don’t recline.
The front step up height for the Edge is 1.7 inches lower than the RDX (17.5” vs. 19.2”). The Edge’s rear step up height is 1.5 inches lower than the RDX’s (18” vs. 19.5”).