I daily a T480 with Debian for work, and I'd recommend it highly. Great performance, battery, build quality, look & feel, etc. We have some 7480s deployed and while they've been solid as well, I much prefer the thinkpad. T series will have better performance and battery than X series, also, so I'd take the T480 over the X1C.
how is the build quality of the t480? I had a t580 for work, and that one crashed when you picked it up at thr wrong corner. and after a month over the warranty, it completely died
I now realize you are trying to buy a laptop on a budget. I’d definitely go for the X1 gen 7 or 8, 16gb of ram minimum. The 1080p screen will give you better battery life but the 4k screen has Dolby vision and will make watching movies a better experience.
The Carbox X1 Gen7 is probably a decent choice, but it will depend on the specs - get at least an i5, and max out the RAM to 16GB - you can't add it later, so make sure to buy one with the 16GB.
I have an x1 Gen7 and it's great. EXCEPT for the battery life which is fucking awful. Maybe 4 hours if you're lucky. It was originally advertised as having 18 hours.
What are the apps that you will be using? I’m really excited by these new Qualcomm laptops coming out. LTT is doing an experiment and having 3 of its employees switch full time to see if they are viable. If you can wait another week I’d see what their conclusions are.