Using the Auto-Assignment (Lead Assignment) rules in SFDC is recommended rather than creating assignment rules in Marketo.
Since creating assignment rules in Marketo is difficult to maintain, I recommend marketers focus on marketing rather than maintenance.
Lead Assignment rules only run on initial Lead creation, you can’t run them again for existing Leads. Thus, if a SFDC Lead or Contact flows through the Sync Lead to SFDC flow step and the Assign To is set to --Use Auto-Assignment Rules--, Marketo will sync any field updates but will not run the record through SFDCs assignment rules again.
If you need to run Assignment rules again, have your SFDC Admin create a custom trigger and flow in SFDC.
The SFDC Lead Assignment rules may required that specific fields be populated. Check with your SFDC Admin.
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