I use Sierra Charts and IB, I don't know if there is any big difference between charting platforms anymore. Sure some will have this whistle or that. It depends on what you are looking to do.
They all have free trials, I believe, take advantage of that.
I can definitely say that Sierra and IB have been flawless for me. The support is A++++++, the users are extremely helpful. Constant improvement in the software.
After trying a couple one's (platforms) out, one will just seem the most comfortable to use, for me it was Sierra with IB.
I have been a user for a couple of years