A log book must be a hard bound book with no pages torn out to be acceptable in court or by the USCG. Any errors must be lined out, not erased or white outed. A computer record is not acceptable.
I used my log books for verification of my sea time as I had no owner signatures on the many boats I worked on around the world, prior to licensing. Even the CG didn't figure I'd fake 9+ years in 4 log books to get a license.
A log book is THE legal record of a maritime incident, IF it has been faithfully kept and filled in on a regular basis. Should one need to go before an admiralty court of inquiry, the log book can overshadow even first hand testimony, because of the fallibility of human recollection.
We use a diary type bound book, with blank pages and a nice fake leather cover. We column each page as we need them, with information suitable for the type of sailing we are doing at the time.
Whenever we are sailing, we can go back to our log book and see the time it took, the mileage we actually sailed, current, wind and sea conditions for each trip and get a pretty good idea of what the day will bring.
It is also a record of oil/filter changes, fueling, and things like what wifi connections were best in an anchorage.