Frankly, QuadriFlow kinda sucks for auto-retopology when compared to ZRemesher. But it comes with Blender for free, so it’s definitely nice to have it as an option.
But ZRemesher is on its way to Blender in the shape of QuadRemesher, coming soon. Combined with the plethora of new sculpting tools, Blender is unmistakably starting to show some muscle towards ZBrush.
And no, I’m really not an undercover marketing guy for QuadRemesher, trust me, just a long-time fan of ZRemesher. 