I'd go with the brown, mainly because I love the look of faux dust and cobwebs on beautiful wood (which wouldn't have the same effect on a grey casket. ...but secondly I think it lends better to more themes, less modern looking
I'd go with the red/brown one too. More old worldly as already stated. I also like the flat sections that hold the side carry bar. It would provide an area you could adhere more ornamentation like wolf heads, skull, spiders, etc. to personalize for your theme. The flatter coffin top also would let you rest dead funeral flowers or provide a place for a weeping loved one to rest their body on.