os.read(0,) vs sys.stdin.buffer.read() in python

Question

I encountered the picotui library, and was curious to know a bit how it works.

I saw here (line 147) that it uses:

os.read(0,32)

According to Google 0 represents stdin, but also that the accepted answer for reading from stdin is via

sys.stdin.buffer.read()

I was wondering what the difference is between the two. Which is faster? Which is the more portable version?