best exchange with most coins

[Nivir]

For me the best exchange site now that has most coins so far is Bittrex because based on my experience I had no problems with depositing and withdrawing in this site, I used to trade in Poloniex but they had lots of issues recently and was afraid I might not be able to withdraw some of my coins too so I just left it there and wait a couple of years until I'll just exchange those coins to Bitcoin.