Derp

I reeeeeally like the second one, probably because of that stock background. For some reason it just appeals to my taste when someone mixes C4D renders with a real background as opposed to mashing everything together, making the sig render look like it's lost or out of place, which is partly why I don't care for the first one.

For the first one you kept with a palette from the render that was more dark-coloured as opposed to respecting both the dark and lighter colours as you did in the second. The second one is by far my favourite of the two since it has perfect balance, imo.