UW (Seattle) is a top 10 program. They are huge so of course they are going to have some clinically oriented faculty, but they have a a slew of world-famous radiologists. One of the most established programs in the country. Mayo-Scottsdale seems like they are really growing and trying to develop their academic pedigree; however, we are talking different tiers here. Mayo-Scottsdale is a 2nd tier program.
I'm not sure you are very familiar with Mayo AZ, because the "academic pedigree" is pretty high. Look--I'm not taking anything away from UW, but with a smaller faculty and smaller residency, you get more exposure to "big names" and "outstanding teachers" at Mayo AZ compared to UW. Not in all divisions, perhaps, but many--for example:
Thoracic Radiology
Mayo: Gotway, former PD of UCSF Radiology residency and winner of multiple teacher of the year awards
UW: Reddy (UW), former associate PD of UCSF Radiology residency
Ultrasound
Mayo: Patel, current president elect of Society of Radiologists in Ultrasound and winner of UCSF residency teacher of the year
UW: Dubinsky
Body Imaging/Abdomen
Mayo: Menias, former Assoc. PD of Mallinckrodt, current RSNA educator of the year, multiple teacher of the year awards at Mallinckrodt; Johnson, former president Society of Abdominal Radiology and current editor of Abdominal Imaging, winner of multiple teacher of the year awards at Mayo Rochester
UW: Dighe
Neuro
Mayo: Chong, former president of Western Neuroradiology; Ross, AJNR Senior Editor, Gold Medal Award winner ASSR
UW: Shibata
IR
Mayo: Oklu, Fellow in SIR, amazing translational research lab at Mayo
UW: Valji
MSK
Mayo: Kransdorf, editor of Skeletal Radiology
UW: Chew, Richardson
Looking over the list, I'd give the nod to Mayo. Then when you consider that the faculty at Mayo is about 30% of the size of UW (42 faculty vs. 134 faculty), you have to agree that with the same or more academic leaders at Mayo, the residents at Mayo get more exposure to the leaders.
As I said, I think people tend to fall back onto old stereotypes for programs in general. I happen to be familiar with both organizations, but as I said I don't know UW as well. Mayo AZ punches way above their weight class in terms of academic pedigree.