Vue render times depend on a whole lot of different parameters. If you're using the standard atmosphere with straight ray-tracing, no blurring, or depth of field, one light, and the renderer set to final, Vue will absolutely blaze. If you're doing an animated spectral atmosphere on radiosity with the quality setting bumped up to 5.0, 27 lights with blur set to 10, depth of field turned on for the camera, and the render quality set to ultimate, you'd better either have a large render farm, or be prepared to wait days if not weeks for your render to finish.

Having not used Bryce in ages...and I really do mean ages...I have no idea what variables it has that affect render times. I don't even know if you can ask as much out of it as you can of Vue, but my guess would be that if Bryce is rendering faster, it means you're asking Vue to do a lot more than Bryce in terms of render calculations.

I'd rather stay in my lane than lay in my stain!