In my 40 years in the financial markets, I have never met a professional trader ( and I know several dozen of them ) that uses either of those platforms, but again, whatever works for the individual. TOS is good for all retail traders, fidelity, I don't know anyone that uses it. Most non-professional traders that I know use TOS for charting, but other platforms with better fills and better commissions for actual trading. That is what I do. But, at the retail level, it is not about what you use, but about whether or not your "P" is bigger than your "L", and that your "P" profits justify the time you spend, the amount of money you need to produce and the ratio of investment to profits. Keeping it simple has always been my mantra, and it has worked well in all of my endeavours. Good luck !! Scott (PS - if you are really serious, get a Bloomberg terminal to stay really plugged in to the financial markets)