Im using various ones. Mostly Binance as its best for analysis. CoinIGY is also top for analysis but they i use some really small, less reliable, slower, overall shitter platforms as they offer the really tiny value coins that havent hit big markets yet. Get in nice and early like our LINDA and ECC trades :)

I look forward to crypto's integrating to the Meta-trader MT4/MT5 platforms. They're fantastic for Tech Analysis. Also Ninja Trader I've heard has some good data sources for large and small Crypto's but Ninja Trader is a paid for platform so unless you really know what your doing on the tech and analysis side of trading its not worth paying for the more professional tools!