Am I the most accurate? What is the most efficient standard manual or electronic?
If you had a manual gauge located right next to the Davis gauge, at the same height above ground, etc. -- then the manual gauge would be more accurate than the Davis gauge.
Of course, you should then carefully, and exactly at every midnight, read the manual gauge, empty and dry it, re-install it, and record and report the manual gauge results for the preceding day. [And do that very quickly, if it happens to be raining at midnight]