I have both a Lenovo X1 Carbon Gen 9 and an HP EliteBook 840 G6 running Linux, I'm very happy with both machines. The HP has a better management of fn keys, seems to lack support for > 4K 30 Hz on its HDMI port with my screen (both that might be fixed on newest generations), the X1 has a better trackpoint handling. Both have fantastic battery life (around 10h) and are quiet. The X1 tends to spin the fan earlier than the HP, if it's an issue, setting the energy profile on "power save" in the KDE battery widget fixes it. Of course it makes the computer slower but it's still quite fast (the CPU is a Core i7-1165G7)
Make sure you avoid hardware that have issues with the camera on Linux, it's a shame we are back to have to check for this stuff.