Random characters for password managers, four or five random words for the ones you have to type. Generated with your browser's cryptographic random source; your settings are remembered, the passwords never are.
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About the strength estimate. Entropy is log₂ of the number of equally likely outputs: characters give log₂(alphabet size) per character; words give log₂(list size) per word. Crack time assumes an attacker who knows the method and can try 10 billion guesses a second offline. Anything over 80 bits is beyond brute force; over 100 is comfortable. For accounts that matter, length beats cleverness and a password manager beats memory.