What Reflect offers that the others do not, is focus. The interface is clean and nearly distraction free. You don't have to spend time configuring your setup and deciding which plug-ins make sense, as you do with Obsidian. Reflect is less expensive than Roam. Of course, everyone's needs and work style are different, but for me Reflect has been the best note-taking application I've used since GrandView on DOS over 30 years ago.