This is 0.4ms shorter on average.

@TielaRose - In Python you can use the timeit module to test the time taken to run anything you are interested in.

Here is a good StackOverflow post where the topic is introduced (with some explanation of what the module actually does):

https://stackoverflow.com/questions/17579357/time-time-vs-timeit-timeit

and then this is the Python Docs page https://docs.python.org/3/library/timeit.html

Then you can just google stuff like "examples with Python timeit" and see how people build their tests (and make nice graphs if you want to be fancy).

Newbie question: how do you know or find out what is faster?

Indeed I used it too

Reversed is much faster :)
And probably more readable