Best ones I’ve used are MindNode and XMind. I actually used MindNode for personal stuff and XMind for work, but now I’ve been gravitating towards XMind alone because it also runs on Linux (besides Mac and Windows) and I can sync my mindmaps to the iPad with SyncThing.
XMind does have a couple of irritating bugs on Fedora around keyboard input (I can’t move focus with the cursor keys, it creates a new node) but it might be specific to my setup. Their support/developers don’t seem to care much, though.
