Depends on what factors go into determining best.trading tools?, ease of use? Liquidity?, product range?
Product types (cash or derivative)?
If you want to trade the cash market, then Binance, coinbase are pretty good.
If you want to trade derivatives then Ill theow my exchange into the ring. We list easy to understand perpetual derivatives of BTC, BCH, ETH, LTC, XMR and XRP. Our BTC Perpetual are on a contract size of 1/10 of a BTC so is very retail friendly. Our trading interface is professional grade. If youve ever traded Futures, itll be immediately familiar.
Check it out on LevelTradingField.com we do a full KYC/AML
Enough about us. I guess Bitmex isnt too bad to trade perpetuals too. Even though their settlement process is a little confusing.