Should I use window.navigate or document.location in JavaScript?

window.location.href = 'URL';

is the standard implementation for changing the current window's location.

window.navigate not supported in some browser

In java script many ways are there for redirection, see the below code and explanation

window.location.href = "http://krishna.developerstips.com/";
window.location = "http://developerstips.com/";
window.location.replace("http://developerstips.com/");
window.location.assign("http://work.developerstips.com/");

window.location.href loads page from browser's cache and does not always send the request to the server. So, if you have an old version of the page available in the cache then it will redirect to there instead of loading a fresh page from the server.

window.location.assign() method for redirection if you want to allow the user to use the back button to go back to the original document.

window.location.replace() method if you want to want to redirect to a new page and don't allow the user to navigate to the original page using the back button.

window.location will affect to your browser target. document.location will only affect to your browser and frame/iframe.

window.location also affects to the frame,

the best form i found is:

parent.window.location.href

And the worse is:

parent.document.URL 

I did a massive browser test, and some rare IE with several plugins get undefined with the second form.