I was curious more about this so I had Claude do a deep-research dive on years with +QBO/+ENSO with a focus on the outcome for the US, specifically the PNW and Northern Plains. It's findings are attached for anyone curious. I did not check these findings on my own so take that for what it's worth.
Overall, there isn't a very clear indication one way or the other. Some years were snowy, others not so much. One interesting finding - these two regions are among the most clear, reliabily consistent signals for +ENSO outcomes (not accounting for the +QBO) in the entirety of the US and it's not a particularly pleasant picture. Although given how the last few La Nina winters have shaped up out here, which is generally frustrating, I'm willing to take any chances.
qbo_el_nino_pnw_nplains_winters.md