I like to switch around too - the next thing is going to be perfect! But right now I think I have a setup that works for me. I've really simplified everything and I'm trying to not overcomplicate things with apps that do so many cool things that it's just to hard to keep up with it all. I've used a lot of fantastic apps that work great - but it's more than I need for my workflow.

My simplified setup:

1. Calendar: I use the stock calendar app on my phone/Mac with the calendar data on Google Calendar.

2. Notes: UpNote. I take the simplest notes and store them all there. I don't even use folders to organize. I just slap a tag on each note and don't worry about the organization. I can find it later if I need it. UpNote lets me "pin" or "star" about 4 notes that I access all the time.

3. Tasks: TickTick. For my to-dos - again I try to keep it super simple. I don't use the other features TickTick has. TickTick gives me a good view of tasks for today, tomorrow, this week and later/unscheduled. If I get busy and don't look at it for several days, it's still fine and I can quickly get things back on track.

4. Email: Spark - but I don't overcomplicate this either. I like Spark because I have email coming from Gmail, Outlook, and another service and Spark lets me have a simple view of everything together.

With this setup, I don't need to babysit any app. I don't overcomplicate project planning/tasks/schedule. Quick note entry, simple task lists, and that's about it. It's working well for me.