What are some alternatives?
When comparing Poloniex and Bitfinex, you can also consider the following products
Coinbase - Bitcoin, safe and easy.
Binance - Cryptocurrencies exchange platform
Kraken - Kraken is a robust, ultra-fast image optimizer. Thanks to its vast array of optimization algorithms Kraken is a world ahead of other tools. Want to save bandwidth and improve your website's load times? Look no further and welcome to Kraken!
ShapeShift - Buy cryptocurrency instantly without the need of an account.
changelly - Exchange alternative cryptocurrencies.
LocalBitcoins.com - LocalBitcoins.com is a person-to-person bitcoin trading site.