The odds are definatly for the informed trader, an informed gambler dosnt get much of an increase in odds.
In roulette your payout is directly porportional to the odds you play eg 50/50 or 1/XX ammount of numbers (not all that up on roulette actually
)
In forex, your payout is proportional to your information -- knowing when to properly exit, or to have some plan on how to exit is better. In roulette it dosnt matter what you know as far as your payout is concerned (unless you can see the future, in which case I'ld still trade the forex instead ;P )