In conclusion from me: YOU are the person who will be using the new camera! YOU need to pick one out. Camera size and weight are big issues, in my experience, for many people. Some people want a small-body camera that's discreet and almost unnoticeable on the neck or shoulder, and the Fuji X-series cameras are that, plus they LOOK beautiful too. Canon Rebels and the smaller Nikon 5000-series models have flippy screens, the Nikon D7500 has a modified flip-screen; some people insist on a touch-sensitive rear LCD screen, which some cameras have and many do not have; it really boils down to what YOU happen to like, and what fits your budget. Hybrid mirrorless? Sony,Panny,Fuji. Compact or full-sized d-slr? Canon or Nikon are awesome.
But make no mistake: the full-frame Nikon D800 and D600 and D610 and D750 have _astoundingly_ clean images at higher ISO levels and in poor light; noticeably better than even the newest, best APS-C cameras, by sheer image sensor size advantages.
It's difficult for people to help you out when we don't know what it is that YOU assign the most priority to. My preferences, or ac12's preferences, or jaomul's preferences, or Gary A's preferences are all very different. I prefer the bigger optical viewfinder of the Nikon FX d-slr cameras; Gary A loves the Fuji's which are hybrid cameras, not d-slrs!; other people like the compactness and low-price of the Rebels and the Nikon 5400-type bodies; I myself do not shoot much in Live View, which is where the Canon 80D and its Dual Pixel AF is, according to dPreview, simply superb both in stills and in video; according to dPreview, the Nikon D7500's higher-spec'd AF system when shooting using the eye-lvevel viewfinder is much better than the 80D's AF system at following action; as you can see, there are a LOT of choices! Pluses of some cameras, minuses too!
I used to sell cameras at retail, across the counter. There's nothing like an in-store demo to help a buyer decide what he or she likes. If you can, definitely try to buy at retail, in-person. BestBuy in many cities has good choices of popular cameras. Pawn shops,
KEH.com on-line,
Adorama on-line, other stores are good for used cameras. Good luck!