Daniel Kahneman's book explains the concepts pretty well:
https://www.amazon.com/Thinking-Fast-Slow-Daniel-Kahneman/dp/0374533555It's less an issue of what type of person you are than what type of
thinking you use for different situations, e.g. responding to a traffic
signal vs. solving a complicated logic problem. You can't use slow
thinking for the former situation, as you need to respond quickly.
Where relevant to mustachiasm, I'd say you don't want to use system 1
thinking on system 2 problems, such as asset allocation.
For many people, the default is to use system 1 thinking (because it
requires less effort), even with system 2 thinking is required. I think
if you train yourself to recognize when you encounter a situation that
deserves system 2 efforts, you'll achieve superior results in life.