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On the market, you can find a lot of password managers with different functions.
First of all, what OS you favour?
Windows, linux, iOS?
Which devices you use?
Secondly, better support is good for you.
Choose from companies, which have quick and friendly support.
What advantages would a password manager should have?
Password generator, form filler, passwords on local database,....
Five years ago, I chosen Sticky Password - http://www.stickypassword.com/
and I'm very satisfied.
I would put the ability to import password lists from other password managers near the top of the list, so if you change managers you do not have to manually enter in all of the information again. I would also look for multi-factor authentication as well - you REALLY want a password manager to stay secure.