Obligatory mention to the incredible Snot block & roll.
It's a website that reviews and rates mainly Sydney, but includes other Aussie and international bakeries vanilla slices and sausage rolls. Any of the high ratings I have tried have been awesome. Try some and it will change your mind and your life. I didn't even eat them until I stumbled across the site and found a couple of bakeries local to me that had been rated 9s. Mind blown!
Tip: you can use the tags to select ratings, eg
https://www.mezzacotta.net/blockandroll/tag/slice10/
https://www.mezzacotta.net/blockandroll/tag/slice9/
etc, or
https://www.mezzacotta.net/blockandroll/tag/roll10/
https://www.mezzacotta.net/blockandroll/tag/roll9/
etc