Final answer:
The E-value in the BLAST report provides the best information about the significance level of the match.
Step-by-step explanation:
The value in the BLAST report that provides the best information about the significance level of the match is the E-value.
The E-value is a parameter that describes the number of random hits with a particular word size. It represents the background noise or significance threshold of an alignment. The closer the E-value is to zero, the better the alignment.
For example, if the E-value is 0.001, it means that there is a 0.1% chance that the match occurred by random chance.