As a long time Mac user, I too wanted to use Mac apps for my trading work. But the more I researched what is available for the Windows side, it become so obvious that the choices are very much better for Windows than the Mac.
Trading is hard enough. Why would you want to give up any of your edge just so you can be Mac-only? The point of trading is to make money, not to support Apple.
By the way, I ended up with TradeStation which I'm very happy with.
Dale