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I'm very used to using web3 = new Web3(web3.currentProvider) and I saw here that MetaMask sample code is using window.web3 = new Web3(web3.currentProvider)

What's the difference between using and not using the window keyword?

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check this question - https://stackoverflow.com/questions/5786851/define-global-variable-in-a-javascript-function

If web3 is not defined as a global variable, but you have "web3 = new Web3(web3.currentProvider)" inside a function - the web3 object will be local for that function only, while with window.web3 it will be globaly accessible

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