Which theory do you think is the best?

title says it all, i personally think that our universe is a simulation (generic, i know) but if you really pay attention, there's some things that are quite strange here and there, so, what theory do you believe?

What would actually change if we found out that life was a simulation? How would that affect how we do things now? The most compelling argument we have right now is the Big Bang Theory because the universe is not a closed system, which means that chaos was very much possible to create the singularity that created life.

In my personal opinion I believe that the universe is infact a simulation as why would "God" let people die