Do I really want to make this choice?
Gu Qing Shan was a bit hesitant, after all, he has never seen anyone choose Lightning of Life before.
In the Apocalypse, all that everyone wanted to do was survive, so as soon as they can, they all chose the Thunder of Death to increase their fighting strength. Who cares about Life or whatever?
Not to mention, many players and cultivators don't even have the chance to choose, even if they broke through a realm.
The awakening of a thaumaturgy isn't a simple matter, as it would affect a cultivator's direction for the rest of their life.
He already knows about how strong Thunder of Death was from his past life. If Gu Qing Shan didn't want to risk it, choosing Thunder of Death isn't a bad choice at all.
This decision will affect the direction he grows from now on, if he chooses wrongly, its effect isn't going to be felt until much, much later.