If I am not mistaken:
T480s should be lighter and has better display. T480s has 1440p display while T480 has only 1080p.
T480 should fit more RAM (32GB), while T480s can only go up to 24GB.
YOur decision from here
HP 840 (the G5 I assume) is also nice.
The thing is however, in my experiences using and seeing countless of laptops until today.
Lenovo Thinkpad is the most durable on average so far and the international warranty is really worth the extra cash.