I tried a ‘personal’ Sized one(A5
Personal size is NOT A5 so don’t be confused.
If you can, go into a store so you can try out the sizes.
I have a few Filofaxes but my main / current one is the Heritage in A5. It really is beautiful and something I would use as a notebook or something if not as an organiser. It is one of the more expensive ones so depends on your budget:
uk.filofax.com/heritage-a5-compact-organiser-filofax.html
The organiser is the traditional “diary” and you can get different one. Check out the professional series, which I got. Also look at vertical and horizontal layouts.
Paperchase do their own inserts which are set up in blocks, which I like and I’m using at the moment. They are v inexpensive and you can personalise it:
www.paperchase.com/en_gb/stationery/diaries-organisers/organisers-planners/a5-undated-diary-organiser-inserts.html.html
For each day, I use the first box for general info like birthdays, the second box for morning, middle mix for afternoon and the third box for evening. I have enough space for appointments etc. The last box I use for “to do” items generally.
Another tip is to use eraseable pens and use colour coding etc to jazz things up and make it all easier to follow.
Bear in mind I’m using it primarily as a personal diary but I had the professional inserts before for work and personal organising and they come with some great project planners and year planners.