D500 is a beast, great low light, but heavy and expensive

Low light stills are also outstanding

Pros:- a much appreciated upgrade in technology (sensor, ISO capabilities, auto focus, metering, video, etc.)- lighter and a more portable than my D300- 8fps- ISO capabilities and noise handling are phenomenal- much more

D7500 is speedy, weight is very manageable (i travel with my 2 kids), low light is awesome and many choices of lens

In good light the D7500 will accurately shoot sports and fast moving kid action in AF-C and it nails focus (meanwhile the D5500 cannot keep up)