Crypto trading Lets Talk exchanges

What are your favorite Crypto Exchange/Trading Sites and Why?

Cryptopia to me is a bit annoying because of the maintenance all the time and i cannot sell as quickly as the prices go up or down.

Poloniex I like that you can click on the current price and it automatically types it in for you in the sell or buy box.

Is there a site that lets you log in to more than one and trade?