Hmm?
1) StrategyQuant manages a lot more Symbols (Indeces, Futures, ..)
2) I manage with it about 400GB dld. Tickdata from Dukascopy on an external USB-drive
3) Zorro uses a rather strange format with most recent quotes at the beginning and the oldest at the end of the file, which to me is a bit questionable if you are dealing with files that has to be upadted - or do you want to to reload everything again and again?
4) Tickdata files are quite large, e.g. way toooo large to load them in Notepad++ or another editor at once and he uses python only to turn around the line sequence due to Zorro's time sequence formate. With normal Windows tools (like powershell) you only can either load everything at once (4GB) or (which will take a very long time from a usb-drive) read and save line by line??
5) I prefer using specialists for the tasks and not one thing that does everything. The specialists are better and provide more and the various tasks of several specialists are better to handle than one thing for all. E.g. compare the editors of mt4 or Zorro with Notepad++.
6) Why reinvent the wheel instead of focussing e.g. only on a better connection?