Okay, but seriously now... the other applications are pretty good, but I don't think any of them are as powerful as Bryce is with the ease-of-use that Bryce provides.

In terms of quality, there's a lot of artists here who can make Bryce sing. Combine Bryce with other tools.. such as Photoshop, a Wacom tablet, Painter, etc, and one can create some really stunning things.

But for me it comes down to time, and Bryce's ease-of-use means I can get up and rendering an idea quickly.