Secondhand BMC or Giant

I'm trying to decide between a used BMC Roadracer SL01 with Shimano 105 or a used Giant Avail 2 with Di2 Ultegra and Reynolds carbon wheels.

Both are carbon frames, are claimed to be in excellent or like new condition, and appear to be from 2013 based on the colorways.

The BMC is listed for 700-850 depending on the secondhand site, and the Giant is listed for 1300 firm. My initial budget was $1000, but I'm wondering if the carbon wheels and electronic shifting are enough of "upgrades" to justify the higher price on the Giant.

For context, I live in Los Angeles and started riding this past summer on a Trek FX hybrid. As I ride more frequently and go for longer rides, I've been wanting to try a road bike. Any insights or advice is much appreciated!