I'd vote with the hand written logbook.
.
Unless you have a real burning passion for data entry- computer stuff- a written log book is so much more personal- so much more fun to leaf thru years later.... and that ability to leaf thru it in the years to come is one of my principle reasons for paper/pen and ink.
How long do you think that line of code on your now-new SSD computer, your USB drive, that CD, and whatever will replace them-- is going to last ?-- or for that matter, be retrievable??
I'm thinking here of my personal experience storing things on 3 1/2" disks (too young for the days of the true 'floppy's)-- in my innocence and ignorance, I thought I'd be able to access those disk's "forever" (they've now graced some landfill long ago.)
.
I had a great aunt who, as a young woman, work'd for the Marconi people as a wireless operator. She kept log books of her activities, separate from those of the company's. I have them now- and they are absolutely fascinating to read- in her beautiful Spencerian penmanship, they transport me back to a never-again era of radio. She was not involved with the Titanic's sinking- but at the bottom of one of the log pages is a note about how she learned of it the next day when she came on duty.
.
Think about posterity... no great grand niece is going to want to-- or be able to-- read a sterile line of code -- but something in your own hand?.. its a family heirloom ! .....

.
.
Lauri
.