TradingView uses a JavaScript-like language called PineScript but has a very dedicated and active community.

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100 % Sierra Chart!! You can create everything what you need.
It is alot to learn but once you figure out it is absolutely powerful
The data from SC is also awesome

Check out the Chart books from Ticino trader at patreon.
All what you need

Good luck

belekas 

So what would be the "easy" pick if one had to go with TS, NT, Sierra or MC? Been researching the topic as well recently

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I have been using TS for 11 yrs. I am currently using TS 10 with windows 10 and have had no problems with it. You can't beat the charting capabilities. However, I only trade the NQ and CL and my charts are very simple with just a couple of indicators. But I love it. To be fair I have only ever used Tradestation products since I started in 1997 using SuperCharts. So, I might be somewhat prejudiced.