I find it ironic that as a tech CTO I'm connected to my phone and computer probably 80% of my day and love playing with productivity and organizational tools -- yet I've still never found anything better than putting pen to paper!
I keep a small pocket-sized moleskine in my back pocket with me, and it travels with me basically wherever I go. I leave it open on my desk during the work day, and I find I "respect" the notebook more than I respect Asana or Todoist or any other digital app. I guess it's because it's in my own handwriting.
I spend about 10 minutes in the morning going through the notebook and another 10 in the evening looking forward to tomorrow. Strongly recommend this approach if you're looking for a slightly more flexible approach than GTD.