The Instax guest book vs digital guest book decision is not really about old versus new.
It's about what you want to remember.
Digital guest books can preserve voices, movement, spontaneous videos, and contributions from people who were hundreds or thousands of miles away.
That is genuinely powerful.
An Instax guest book preserves something different.
The physical photograph.
The handwriting.
The page.
The knowledge that this exact object was created while everyone you loved was together in one place.
That is powerful too.
If one format clearly matches how you experience memories, choose it confidently.
And if both matter to you, don't force yourself to pick.
Let digital preserve the things paper cannot.
Let the physical album preserve the things a screen cannot.
Years from now, you probably won't care which wedding guest book trend was most popular.
You'll care whether you can still hear the voice.
See the photograph.
Read the handwriting.
And remember the person.