That is dependent on many factors, not the least of which has a distinctly spiritual component to it. My own writing is almost exclusively written in first-person and I draw inspiration and content from the dream time. Some can recall playing first person in one dream and then remember as simply being an observer in another, not an active participant.
For writers, using a first person approach can be quite effective in a book about a cancer survivor. The energy that literally jumps out of the page can be felt. Third person, on the other hand, is great for historical writing. My point is that each has its own pros and cons... and its own energy, which we infuse with every word.
The spiritual component of my life includes a fair amount of personal effort but has enormous benefits. I discovered that my mind was ideal for visualization and, as a result, it has added a depth to my writing I did not have before. As I write, I am living it out in vivid color, in many cases using elements from my dreams.
So, I'm a first person guy and writing in 3rd person would be more difficult.