We do have a launch setup which includes different properties e.g. a property for the corporate page, a property for some calculators which drives conversions. Is it possible that eVars persist through different properties?
I persist a searchterm on property 1 and the conversion is made in property 2. Is it possible to do a analysis which searchterm drives the most conversion events? We do have a ONESUITE in AA, where it all comes together, but I assume as soon as the property changes, the s object is lost?
After some investigations, evars persist along ECID value (visitor identification). If the ECID or mid parameter is the same across properties for the same user than the evar will persist and be attributed to the same user. So just making sure that every property is using the ECID Service in Launch.
The case is that eVars are very powerful, as they persist along e.g. a session. So if a User does a conversion event, I can analyse which eVars (e.g. searchterm, event actions, productviews) happend in the same session and gave credit to the success event. As the conversion is on another property, these powerful features are not available per default, as the persistence is not there along different properties.
That is one option, I don't know your full use case. Having a campaign logic in place would be another. I am more on the technical side than on the analytics, so I try to provide technical solutions...
The only thing I can see is some custom logic with cookies or session Storage if both properties run on the same (top) domain. The s object is re initialized per page load, so you can't even store something there for multiple pages.