Assuming the 2.3 is at $1999 (labor day sale), and the Seigla is at their current sale of $2590, trying to understand the benefits for the additional $600. All carbon frame, shaving off around 4 pounds, and the true grit fork seem like the main ones.
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ADV has GRX 800. Seigla is Rival (not AXS XPLR). Both bikes are 1x 40T / 11-42T. Similar geometries as well.
[https://www.rei.com/product/190608/co-op-cycles-adv-23-bike](https://www.rei.com/product/190608/co-op-cycles-adv-23-bike)
[https://www.laufcycles.com/product/lauf-seigla](https://www.laufcycles.com/product/lauf-seigla)
by cataflic