Hello, so I've been planning to get a DSLR and lens. I've been shooting birds with a Lumix FZ80 for over a year now and figured I'd upgrade. I plan on getting the Sigma 150-600mm Contemporary. The thing I can't decide between is either the Nikon D500 or Cannon 90D. They're both in my price range of $1600 USD, but I'm not sure which to choose, so I was hoping that you guys could give me some input.