Disagree UPS Mailbox is a bad idea. Gives way more flexibility in mail delivery choices. Post office forwards to UPS. You call or email UPS they send to any address you request when you request.
Post office forwarding is good if you are going to be in one location for along time. Then you need to notify the post office to coordinate any move giving them time to affect the change.
We have ups send our mail every two weeks or as needed. Post office forwarding goes out everyday. UPS has worked well for us for over 10 years. There are other services that Let you view your mail on line.