i think m etatrader 4 is more popular also many trader using it ,also you can attach your robot in metatrader 4 so i think mt4 is more better than mt5 because of that ,withink this tow minutes you should do it According to me if it is to decide that which is the best online software then i will personally prefer the meta trader 4 because i have used this software and i have found this software so easy to use because the graph analysis in this software is easy to understand.