Analyze this. Why would bigger planets like Jupiter and Saturn have more moons orbiting around them than Earth? *

more debris while forming and a bigger target for smaller planets astroids etc

Explanation:

A planet like jupiter many times the size of earth during the early days of the solar system could have had multiple earth like moon incidents where planets or chunks of rocks could have crashed into them. not sure if this was what you were looking for but i hope this helps.