I have done a post-trip short report, a live trip report and a post-trip detailed report. They all worked for me but they all fulfilled different purposes.
On trip 1 I was with friends (13 women ). It was on WDW, and I was basically doing an efficiency report. I was very proud of how well planned that trip was and wanted to share the feeling. Days were extremely long and intense (EEMH, it was the first time going for most of my friends, we wanted to do everything in 3 days). Something short to express OMG we made it!!! was the right call.
Trip 2 was a solo day on Disneyland. Adrenaline was high for RotR, I needed to share the feeling. I was also fighting 9 hours of jetlag and trying to stay from rope drop to close (failed), so posting live updates and interacting with people who cared made my day much better.
Trip 3 was a contemplative smell-the-roses and reflect kind of trip. I took pictures there and then started my trip report on the train back home. Writing the trip report really helped to cement my memories.
Writing trip reports is always fun, but different trips call for different formats. Find what works best for yours