Many Accounts Or Just One

I'm setting up a VPS for the first time and I was wondering how I should structure things.

I can set up one account for myself with one password, and control all of my accounts (around 20 or so?) with the same credentials. The benefit to this is it easier to manage my credentials, and I can change my password every month or two. With so many accounts I rarely change them.

I can also set them each up as separate accounts like I was used to doing on my shared hosting plan. The benefit to this would be if the one account was compromised the other ones would not be as exposed, and managing everything will be easier.

I guess a third option would be to group most of them under one account, and give the more security critical ones their own account.