Those two either-ors you presented are strongly biased toward waiting, unless you only have a year or two to live.
As an accountant I often get asked by clients if they should start collecting their Canada Pension as early as possible, at age 60, or wait and collect a higher amount later. I almost invariably tell them to start collecting it right away, and enjoy it, because you never know what's going to happen in the future.
The best laid plans of mice and men, and all that.