My favourite platform will be meta trader 4 because it is quite reliable and fats and fits in my list of requirements,.I do find it a little complex sometimes which is why i am learning to operate it before i trade fully on it. actually my operating system is windows XP so i must use MT4 for opening trading terminal.i have no any choose or any option for this but i am very much happy with my forex business and with MT4.i think this is a perfect feature of forex business and i know most of the trader use this and they also happy with this meta trader 4 version.