I'm still in the middle of a project for a client but took some time out inbetween edit revisions to run a side by side comparison of the same snippet of interview material and trying my best to get the same results in the 3 NLE's I have at my disposal.
As you can see in this video clip, as much as I tried, each NLE rendered out a different looking clip - no matter how much I tried to get scopes, levels, etc to match up in each NLE.
Each clip has a power window/clipping mask applied to the subjects face, the same LUT, a vignette and Noise reduction applied to mitigate the less than stellar recording bitrate of my Olympus EM5 camera.
Render times were pretty fast even with NR applied except for Vegas since there's no real way to pre-render the timeline and to utilize that like you can in Premiere Pro and Resolve.
I'm unsure what to make of this test tbh - What surprises me the most is the marked differences in render quality - the Vegas render looks the smoothest, yet with a flatter look, where as the Premiere Pro clip has the most banding in those gradiated areas. Resolve seems to fit inbetween the other two in that regard. Overall color my nod goes to Resolve with Premiere not too far behind. I'm not sure what happened with the Vegas Pro clip with the more muted color palette as no saturation was applied to any of the clips. The shadows also look a little smokey in the Vegas Pro clip
What I will say is that of the three - Vegas was the one I spent the most time in trying to get the look I wanted and still couldn't get there. Once I understood how Resolve works for grading, that took the least amount of time given it's excellent motion tracker for power windows - I didn't have to spend time adding key frames as compared to the other 2 NLE's.
Given I'm still using a measly GTX-660ti 2GB card, it shows the hardware utilization with Resolve using the most followed by Vegas and Premiere Pro coming in a distant third when it came time to render.