do not limit your trading to any one vehicle. imho.
wait for a signal that gives you a high probability of winning and then trade. sounds so easy, but it is not. the patient ones make a living and the gamblers do not.
think of the micro account as an investment in your trading education!
though i still demo new strategies all the time!
imho: you can not demo the emotional feelings you get when real money is appearing and disappearing in front of your eyes.
I couldn't believe how even a dime a pip made me...