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Hi Peter.  Having longer lived ids are better so that users stick to a single variation.  Many implementations have both logged in ids and logged out - anonymous ids.  Both can be set as attributes.  When you start your experiment you can choose which id that you should target based upon which type of users it is aimed at.

Here is some advice in general: <https://docs.growthbook.io/faq#what-do-i-use-for-an-id-attribute-in-the-sdk-if-my-users-arent-logged-in>

Thanks for the link that was helpful.

What happens if you want to track a user through the funnel, when in our instance they will have logged in, before they purchase.

The bit I'm struggling to understand is if we set a `sessionId` how does GB use this to track events in from the Mixpanel data as our `sessionId` doesn't relate to our users in Mixpanel/

If you set multiple ids that in Growthbook you can create an Identifier Join query to link the two up: <https://docs.growthbook.io/app/datasources#identifier-join-tables>.