I have User-ID setup inside my GA with Session Unification ON
Now I want to track conversion rate from the users that visited the website and the ones that signed up
Right now inside my code when user signup I set his UserID and I trigger the event that he's signed up, and I can see that data inside User-ID View, but I cannot see a conversion rate between visitors and the ones that actually got signed up (since it's only displayed inside UserID View).
Would it make more sense that for the signup goal I just trigger the event that the user is signed up (and track conversion rate there)
And for the other goals that I need for the logged in users (like buying stuff and similar) I create the Goal inside User-ID View and track those conversions there?
It depends on what you mean by conversion rate. If you are interested only for registered users you can see it in the User-ID view, if instead you are interested for all Analytics users you will have to use the standard view (and set the goals there too).
To avoid misunderstandings, I refer to the number of goals in general. User-ID will show only in User-ID view. However, you can send userId as custom dimension too, so you can read this value in standard view too.