I drew this daily in my pocket moleskine sketchbook and feel a little torn. I like the pre-printed dates in the planner, which works as an extra stimulant to draw every day. On the other hand, my colours bleed / shine through a lot which causes a few annoyances on my side. And on one side I can get over that, like how I get over the pre-printed lines. On the other side, I just like it more when it doesn't show that much.
The added benefit of using an 80-page pocket sketchbook: it fills up much faster which works as a great motivator too. One of these days I will actually fill up an entire sketchbook ;)
So, for now, I think I'll switch to the sketchbook. As my friend said, I can always change my mind again.