IPsec is standardized, Wireguard isn't. This is a two-edged sword; the standardization process has hurt IPsec quite a lot (to the suspicion of active sabotage) but at the same time it's much easier to get an IPsec setup certified for government use.
(Also, cf. down in the thread, you don't have to deal with the Wireguard people showing up and complaining that you implemented it.)
IPsec is standardized, Wireguard isn't. This is a two-edged sword; the standardization process has hurt IPsec quite a lot (to the suspicion of active sabotage) but at the same time it's much easier to get an IPsec setup certified for government use.
(Also, cf. down in the thread, you don't have to deal with the Wireguard people showing up and complaining that you implemented it.)