Redirect user after registration based on field value

I have specialist form which needs to be completed by users if they answer Yes to a question on the normal CB registration form. They will then be redirected to another form to collect the details. Probably RSForm.

There are a lot of trigger options for firing this in Auto Actions so which is the correct one?

Thanks

onAfterSaveUserRegistration is the safest trigger for that. It's fired just before the registration complete message and can be safely used to redirect away. It also contains the user object so substitutions can be used in CB Auto Actions for their user object. However if you're using CBSubs to collect payment during registration this complicates things as CBSubs has to take over after registration to begin the payment collection process.