I've found that NinjaTrader offers everything SR does and more. I know that SR has a 'buffering' server that resides between PatSystems and your PC, in which NinjaTrader does not and connects directly to the servers. If you put NT up next to SR you will see the latency difference and visually see how NT price and quotes display faster.
The execution platform for TS seemed to be difficult to use and the fill confirmations tend to be slower, thereby not allowing you to know if you have a trade on (or out) until seconds later.