I use a pen and a cheap notebook (A7, squared). I organize different topics (e.g. work, personal, etc) in different pages. For tasks I follow the basic bulletjournal ideas.

I tried to use technology before (particularly a smartphone), but the UX still sucks compared to the pen and paper. For long texts, typing on a screen is too slow. For small texts, the unlock-open the app-type cycle is annoying.