Using still a ThinkPad X220 with Linux and will switch likely this year to a X13 AMD Gen3. I personally prefer the X13 because it is solid, powerful and provide many connectors. I hope the next MediaTek WiFi-Chips are better this time, if not Intel-WiFi.

The X1 is slimmer, lightweight but scarifies a lot and is expensive. The X13 ARM is passively cooled which a major benefit, similar to the MacBook Air but due to ARMs and Qualcomm bad support of Linux not even an option. A passively cooled AMD variant would be more interesting.