There is no BEST exchanger that satisfies everyone's necessities such as low transactions fees and have a good market trades and volume. But still, there are better exchanges and trading platform such as Binance and Bitforex which has both good volume and trades. You can find what suits your satisfaction by going in Coinmarketcap.com and sort the exchanges with based on either Liquidity, Adjusted Volume, or Reported Volume.

For me the best exchanger that fits my necessities is Coins.PH - an exclusive wallet that offers both exchanging through Bitcoin, Ethereum, Bitcoin Cash, and Ripple, and ofcourse the main Philippine Peso fiat. For me it was an exchange as you can trade in it yet not the same as most trading platform offers.