Looking to buy a Nikon APS-C camera.
Seems like the D500 is the flagship but besides the dual memory cards is there big difference between the 2? It's going to be permanently mounted to a Tamron 150-600mm.
the d500 has excellent tracking and speed, but then again the d7500 has the same sensor, image processor and metering system. it gets 8fps which is plenty of speed imo. however it doesn't have the same autofocus system, but does have group autofocus.
the d7500 also supports wireless flash (which the d500 doesn't).
honestly, unless you're specifically looking to get a d500, there's a lot in the d7500 which makes it my pick for someone looking to get a "nikon aps-sc camera" that will be mated to the tamron 150-600mm. if not for birding (assuming that is the use for that lens), maybe a d7200 would be sufficient.
fstoppers article comparing the two:
https://fstoppers.com/gear/nikons-new-d7500-shares-much-d500s-dna-172695