Just some thoughts... No one site will solve your needs. Already I'm realizing that I would like intraday analysis and none of these sites do that. None of these sites have pre made charts on butterflies, condors etc.. Scarr can do that but you have to customize the chart. I can see why quant traders recommend learning python. So much of this stuff is just data management. Gather the data, clean it, organize it, analyze it (cointegration, correlation, momentum, lead lag etc) and then compare relative to other securities.
This work isn't so much difficult as it is tedious.