Yellow glue is stronger than white glue, but white glue is fine.
Screws are good for providing clamping pressure where clamps aren't available. So if you don't have clamps or you just can't get clamps where you need 'em, then screws will do. But the glue is what is doing the job, not the screws. They just provide clamping pressure and then they're no longer useful. They're just there.
Unless you are using the dowels for alignment, which can be handy in some cases. I finally figured out how to make mitered corner boxes using biscuits and a silly jig on the table saw to get the miters cut correctly. Plus a clamping jig that gets the pressure square to the joints. Used a few times now with good success.