Bottom line, find something that works for you, how you process information, and that you'll actually use all the time.
My Grammy used to keep spiral notebooks with all her antique/collectible plates in them. She had about 3 or 4 of them filled up (the family quit counting after going through 200 plates with tons more left to divvy up--I really hope I don't end up with that many VSMs). She'd put a little sticker with the number of the notebook and the page number on the plate. In the book, she'd write down what she paid for it, the date she bought it, information about the markings/decorations, and anything she could find on valuation with the reference where she found it. She kept this up for at least 20 years!