In an ideal world I'd also like someone free and floating no matter the model, but if I'm weighing the pro-cons then I'd still take MD only without a float vs supervising nurses with a float. I work in a place with sick patients and marginal CRNAs, and it's still a pretty damn rare occurrence that the call MD's physical presence is required to the bedside in PACU for a serious issue.
If you have a practice with enough ORs, then it becomes a near statistical impossibility that at least one person won't be between cases. And if you become more lax with post-op ICU admission criteria then there will almost never be a known tenuous pt just sitting in PACU waiting to detonate. But to deal with the rare times there is a PACU emergency and everyone is tied up, you can also ask admin to make sure the rapid response team or ICU/ED attending can respond when no anesthesiologist is available.
e:
@nimbus , how does your practice handle trauma addons, PACU, blocks, etc?