One can use a password manager to avoid reusing passwords. The password manager I use (Bitwarden) can generate randomly passwords, as long and complicated as I want.
While password managers are great, and I use them myself. It's worth noting that it's extremely important to secure that password manager with a complex password or passphrase. Since, effectively the only thing that's stopping an attacker is that one credential. Although, I would probably recommend having a physical key as well, since that would mean they would require physical access to the password manager, which would effectively reduce its attack surface.
The use of passwords and passphrase has advantages and disadvantages, if the password is easy to remember while the passphrase is not, both have different levels of security protection but for tight security, passphrase are the right choice.
Arguably, passphrases could be easier to remember depending on how you generate them. Although, the same goes with how easy they might be to crack. For example, lets just go through a hypothetical situation where an attack has gained physical access to your computer, which is in your room. They sit there thinking about what the password or passphrase could be, so they take a look around your room, they see that you love Lord Of The Rings (LOTR), and your room is plastered with posters from the movie. So, they make the sound judgement of because you like LOTR's that's probably in the password/passphrase. However, that might not be enough, so they continue looking around your room, you've got a football shirt on your wall with the number 6 on it, which might indicate your favourite number. Therefore, the attacker now makes the assumption that either that number is in the password itself or you might have used that number to generate the password. Therefore, they put two, and two together, and take a look at the LOTR book you have sitting on your desk. They go to page 6, and page 6 has nothing, but "One ring will rule them all". Bingo, the attacker has now effectively guessed the password using external influences.
This might be a little far fetched, but I'm trying to give an hypothetical on how attackers could piece information together. The passphrase could actually not be more secure. It's only more secure from brute forcing by default only without any other information being taken into consideration. Plus, in this hypothetical I gave the example of the attacker having physical access, but they don't need that. All they need to be able to do is look at your username, or your habits online which they can do remotely.
So, I wouldn't go as far as using a blanket statement like passphrases are better. It entirely depends on how you generate them. A password which has been randomly generated by a password manager at a certain point becomes uncrackable using bruteforce, and with a dictionary attack. So, really you can't get any better than that. It only becomes an issue of remembering that. Passphrases brings back convenience, although what you could potentially do to prevent your habits from sneaking into the generation is, getting the password manager to generate the password for you, then substitute the letters into words. You should still probably be looking at a random word generator them though, since you could use words which your familiar with which again, potentially could compromise it if an attacker uses your stylometry against you. Although, I must admit we are starting to get a bit into fantasy land now.
