There was recently an excellent, or at least envy-inducing article on logbooks in the Nov/Dec "Good Old Boat."
They recommend a multi-volume system, with separate books for voyaging, maintenance log, and engine log. I had come to similar conclusions myself, when trying to develop an electronic version.
Coming from a laboratory notebook lifestyle, I always use pen on written records. "What's laid is played." You can write in corrections, but it leaves a record of the correction. (It's not unusual, down the road, to find that the correction was the error. Or that the reason for the correction turns out to be the interesting bit.)
Personally, I like to have some kind of "form" to fill in repetitive data. And then a free-form area for general notes. The form is a kind of a mental prompt or checklist, and aids in later transcribing things into a spreadsheet (if so desired.) At least that's what I do in the lab. Still just mostly "good intentions" to do something like this for the boat.