Absolute elevation: fewer intermediaries to the Prophet ﷺ. The measure reaches the ultimate source of the report.
Relative elevation: fewer intermediaries to a particular eminent transmitter or compiler; the chosen scholar is the comparison point.
Case 1: A has six links to the Prophet and B has eight: A is elevated absolutely by count.
Case 2: A has three links to al-Bukhārī and B has five: A may be elevated relatively to al-Bukhārī.
The endpoint being measured must always be identified before a comparison is meaningful. “Fewer intermediaries” alone is incomplete without specifying fewer to whom.