IIRC, Wells managers are not allowed to provide external references. Is that correct?
If so, then being laid off vs fired would be unknown to future employers. The most they would get on a verification check is that your employment ended involuntarily.
If one suspects that they'll be fired within the next six months, is there any reason to quit vs waiting to get fired?
The optimal thing to do is look for other work and hope for a layoff, but in the absence of those, why would/should someone quit instead of waiting to get fired, in terms of future employment elsewhere?