But the huge difference at the end of the day is that when you have Portfolio trading Expert Advisors you can not take only one strategy out. You can but you have to disable all the rest which is not really the thing we want to do.
Basically if your trading style is to trade portfolios, that you should do the Trading Portfolio Expert Advisors, and if you want to trade many EAs and to take out only the best performers, you need to have the many charts with EAs at each one.