Here is a link displaying recent demographic data for Scottsdale and Plano. There are a few interesting differences between these two affluent suburbs:
https://census.missouri.edu/acs/prof...16000US4858016
* Scottsdale has a median age 8 years older than Plano with nearly double the share of senior citizens.
* Plano is much more racially diverse. Scottsdale is unusually white compared to Arizona overall.
* Income levels are about the same overall but Scottsdale has more variation than Plano, with a little more at the top and bottom of the scale and less in the middle.
* Scottsdale has more residents working from home and average commutes are 4 minutes shorter than Plano.
* Plano's households consist of a much higher share of families than Scottsdale's. Scottsdale has a lot more single persons.
* Both cities have the same share of college graduates a little over 55%, very high considering the national average is about 30%.
* Plano has over double the share of foreign born residents and more state natives, while Scottsdale has far more originally from another US state.
* Scottsdale's housing is substantially more expensive. These numbers are not reflective of today's real estate market, but the 2012-2016 average puts their median at about 400K vs. 250K in Plano. Even with Texas' high property taxes, that is a huge difference.
Of course, none of these statistics reflect Scottsdale having a more scenic, resort-like environment while Plano is more of a standard, if rather diverse and corporate-oriented, suburban community. They are both objectively good quality places but one's own circumstances should dictate which is the better fit. Retirees or affluent singles would probably be more drawn to Scottsdale, and families of varied ethnic backgrounds to Plano.