Optimizing Lifecycle Processing in Marketo with Fewer Trigger Campaigns

I don’t think there’s a “best way”. Too many options, too many personal architectural preferences. I would use Add to List/Added to List Trigger only if the list serves a purpose. Request Campaign/Campaign is requested Trigger (or Execute/Executed Trigger) should be more common to bind stuff together. I also like Change Data Value/Data Value Changed Trigger or Change Program Status/Program Status Changed Trigger. As always: It depends. :-) 

I agree with Michael! 

Also, you can usually simplify this by removing the intermediary list entirely and letting the lifecycle logic live in a single trigger campaign. 

For example:

Trigger: Fills Out Form / Program Status Changed / Data Value Changes (depending on your lifecycle entry criteria) instead of adding a person to the list and then updating the lifecycle stage based on list additions. This removes the dependency on operational lists and reduces the number of triggers.

IMHO, operational lists can still be useful for reporting or segmentation, but they’re not required to drive lifecycle movement. In many mature Marketo instances, lifecycle transitions are primarily driven by Data Value Changed, Program Status Changed, or Score thresholds, with minimal reliance on list-based triggers. This approach usually keeps the lifecycle framework cleaner while reducing operational overhead.

Aside from this, if you're using Marketo's RCM, then you always have the option to have the transition rules in the modeler itself, but I personally prefer smart campaigns to manage stage movements as it gives more utility + customization option (e.g., allows me to update fields, sync QLs to Salesforce, etc.).