I did use a Nokia till very recently. Now I own a smartphone with lineageOS. I haven't really made up my mind what I like better. Dumb phones are quite limited but come with a great battery life and almost no bugs thanks to their limited capabilities. The smartphone otoh requires charging at least every third day and I am not even 100% confident that the alarm clock will always "just work". It is kind of useful at times (offline navigation with gps, for instance) but also a bit of a time waster.
Tough call.