It all depends on how you use it, but I rate Amibroker as #1.
I recently moved from NT to CTS T4 as NT with Rithmic is not providing server-based OCO order. T4 is also cheap compared to NT and I experienced T4 DOM and order management are better than NT. For Indian markets, I am using Ami. If Ami becomes available for other markets, I will definitely switch to Ami from T4.
Each platform has its pros and cons.
I recently moved from NT to CTS T4 as NT with Rithmic is not providing server-based OCO order. T4 is also cheap compared to NT and I experienced T4 DOM and order management are better than NT. For Indian markets, I am using Ami. If Ami becomes available for other markets, I will definitely switch to Ami from T4.
Each platform has its pros and cons.