Gambling is already a very lucrative business and an industry of it's own. To me it's of no use comparing both games as each of them can fetch you a very reasonable amount of money if we'll organized and managed properly.

Your question is very interesting and it seems you're wanting to get into eaither of this businesses and if no, I really don't think it's necessary asking this very question but if yes then I will suggest one gets into casino because it doesn't really require much of hard work as ones profit is earned per very one who uses it and it is also much more easier to draw more customers to your casino.