Firefox most of the time, replaced by Chrome on one of my configurations, where Firefox would lead to graphic card freezes from time to time. Edge for Teams at work. Opera once in a while because I am nostalgic of the fantastic Opera mini browser on early versions of Android.
Also, Firefox on Android or Fennec on phones without Google Play.
Joplin is one of the most important apps I use daily on my Android phone. The desktop version for Linux, an Appimage, synchronizes with the shared database used by the Android app. One can use common cloud services or pay a small fee (now about 18 euros/year) for a specific cloud synchronization service (1Gb).