Being a pessimist, I can only list the negatives:
X1 Carbon seems to have the worst cooling / thermal dissipation (only 30W). Do note it also has the smallest battery capacity, smaller than many handhelds even.
Asus is just Asus. Have they even fixed the stuttering due to bios firmware that has been affecting all their laptops for years yet? Panel looks super grainy too. (X9 config? Going to be pricy, but then again choosing 64GB, guess this isn't much of a concern here)
G1a..just no. I don't even want to begin. The battery life on that 2.8k is really bad. And the 1080p version is a really mediocre panel that barely gets bright enough indoors, adjusts non-linearly, iirc too. The keyboard is meh, personally not into it but can't really explain what was wrong besides that I much prefer lenovo's. Avg speakers. I don't know what MLID smoking recommending it but it's overrated (imo).