Hi Destiny, if you look around the site there is plenty of information about the difference, but most people myself included start with spread betting and treat it as a primer for futures, it allows you get the feel of trading with real money and you can open an account with a small amount of money, but if your looking to scalp or trade fairly small movements unless your gifted you will find it hard work, i found if using a long time frame it was ok but didn't suite my personality, trading futures using direct access you get the price on the screen with the odd point of slippage and a small spread, the spread betting firms can and do move the price in there ,although they refer to the cash index i believe that they are really looking at the futures index, im sure there are more knowledgeable people on here who can add a bit to this.
Regards Mark