Beginner friendly oneshot/adventure and pre-gen characters

Hey!

I'm interested in playing some Starfinder with my buddies and was wondering if there are any free/available oneshots/quick adventures for Starfinder 2e to get the feel for it.

We have played the Starter Set and also Rusthenge from PF2E so we are a bit familiar with the system.

I noticed that there are the Starfinder 2e playtest adventures/scenarios, but are they compatable with the full release or are there any other similar adventures?

And is it better to make characters using Starbuilder or playing with pre-gens?

Thanks for all the help!