Stocks are much easier because of the pace. You are able to stay aheadof the beat much more easily.
The flip side of the coin is the money velocity. The minis run about 50 times more profitable.
If I were making a recommendation to a beginner I would suggest all capital in stocks and at some point, move a minimum of 20,000 to an emini account to get started there..
About 6 months prior to moving capital I would go through a ramp up in papar trading to be sure you have it down..
At some point you have to cap it out for both and then let someone else manage your surpluses.
In three years starting with anything, you should be able to trade full time and live comfortably. Doing that on stocks alone is the best way to begin.