Obsidian is seriously the best note app even regardless of whether or not you use "second brain" features. A huge advantage is always having your notes on the device. Want to back up? Easy! Want to sync? Do it! Need to print a specific note or send it over? No one's stopping you!
Obsidian is by far the most valuable product I interact with on a day-to-day. I've been using it since the beginning and the evolution of the community and product is so beautiful. Obsidian is quite literately my second brain until I die.