Should I go buy a Nikon or a Canon? or some other camera for taking mostly nature and city shots?

While I have a Canon Power Shot SX530HS, I’m not going to tell you to pick Canon as a blanket statement.
Look into a few of the better known brands (Canon, Nikon, Olympus, etc.), and see what the specs on each tell you....decide which features are important to you, and make the decision based on what you’re looking for.