Hi mraogon,
Welcome to the forum!
The two rules differ in what they try to accomplish as follows:
- The Management Rule is meant to match "management" traffic to the box from trusted sources. The purpose of the management rule is to ensure that only the specified sources can access the firewall. It would be typically placed towards the top of your rulebase.
- The purpose of the Stealth Rule, which would typically follow the Management one, is to drop traffic to your firewall initiated from any source. This is something you want since the authorised administrators' traffic will have been matched by the management rule.
I hope this helps.