This one is highly personal—people have different needs for organizing their events/appointments as well as their to-do lists, but the format on the Moleskine Weekly Classic Planner works great for me, and the minimalist form factor of the soft-cover (in particular) is great for my desk or for traveling with me in my backpack:
Moleskine 2024 Weekly Planner, 12M, Large, Sapphire Blue, Soft Cover (5 x 8.25)
Amazon.com : Moleskine 2024 Weekly Planner, 12M, Large, Sapphire Blue, Soft Cover (5 x 8.25) : Office Products
The left-hand side has the days of the week with space for a few items and the right hand side has a lined page.
In college I used a spiral weekly notebook that only had the days, and I used it almost exclusively for deadlines (assignments, tests, etc), but in startup life, I have way less structure and tasks and priorities shift so quickly that it works much better to have space for something like my weekly “wishlist” without the constraint of needing to pre-determine when I’m going to do anything in particular. And then I can choose what unfinished tasks to move to the next week, while still being able to very easily go back to previous weeks to look for tasks that haven’t been prioritized.
I like the soft-backed version in “large” (which is A5, roughly half the size of a standard piece of paper). It lies reasonably flat open, is quite thin (not a lot of extra “filler” pages), has a bookmark ribbon, and also an elastic band to hold it closed.
For 2024 I had trouble finding it locally so I tried the Leuchtturm1917 weekly version (in “medium”), which seemed basically identical (I did a fair amount of searching Moleskine weekly vs. Leuchtturn1917 weekly and it seemed like people were mostly either brand/loyal or cared about paper quality for particular pen types), but it turned out that the lines on the right-hand side were too narrowly spaced for me :/
After calling around to all the bookstores and office supply stores and striking out, I was surprised to find one at Target. (Fun fact: the Moleskine website shows the “myrtle green” and “forest green” to be basically identical (very green), but the forest green is actually mellow and a fine substitute for the “sapphire” (navy) that I usually lean towards.)