I photograph birds and nature a lot and enjoy it. It's a quick way to capture a moment that quickly disappears! I then use the photo and take my time to draw in the details that I wouldn't have had time to with birds.
Photos are also great in inclement weather when you can't spend a long time outside!
Plants and trees are more easily sketched and watercoloured since they don't move much, other than a little breeze or the light changing.
I really prefer the journaling as it is a more personal way to record your time with nature. Perhaps more "grounding" if you will.
Really love Holly's style with the watercolour! I dabble in watercolour already so this is a good style for me. I love how she has the dates painted in and the notes are great too. Her style has really inspired me to record even the smallest of items such as a pine cone or a mushroom. Very interesting aspects of the journal!