It's just a higher priority queue, they can both be fast but the expedited review will always be fast.
The Amazon App Store routinely takes weeks, and often won't even process revenue or download data for long delays.
The iOS App Store can take up to weeks too.
This is how they work. How you mitigate crashes reaching production must account for how they work. For me that meant adding a QA process before publishing. Unit tests can also help.