Well written reply with details information. I can adhere to the fact of Binance, kucoin been a recommendable exchange due to their active operations of providing similar exchange services with high quality customers service but that of bittrex is what I don't seem to understand why you even included it in your recommendation. It's an outdated platform as you initially stated. It was one of the best (if not the best) together with poloneix before the arrival of the likes of Binance.

But their lack of innovation killed the exchange out of the limelight. Choosing the perfect exchange goes beyond just what an exchange offers but also depends on what the traders want as I have early mentioned. Therefore, until the OP comes out to outlines his wants in an exchange, he/she won't get the perfect answer he deserves.