The best decentralized exchanges (DEXs) are those that offer a high level of security, transparency, and decentralization.

One of the top DEXs is Uniswap, which utilizes automated market maker (AMM) technology to facilitate trades.

Another highly rated DEX is Kyber Network, which allows for the instant exchange of tokens without the need for order books.

Bancor Network is another popular DEX, which allows for easy conversion of tokens and has a user-friendly interface.

0x Protocol is another well-regarded DEX that utilizes smart contracts for token trading.

Another notable DEX is AirSwap, which utilizes a peer-to-peer trading model and offers low fees.

IDEX is a decentralized exchange that utilizes a hybrid trading model, combining the best features of centralized and decentralized exchanges.

Loopring is a DEX that utilizes zkRollup technology to provide fast and cheap trades.

Another up-and-coming DEX is Serum, which utilizes Solana blockchain technology for fast and low-cost trades.

Another highly rated DEX is Balancer, which allows for automated portfolio management and liquidity provision.

Another popular DEX is SushiSwap, which utilizes a liquidity mining model to incentivize users to provide liquidity.

Another top DEX is Vega, which utilizes off-chain order books for faster and cheaper trades.

Another notable DEX is Alameda Research's FTX, which offers a wide range of trading options and low fees.

Another highly rated DEX is dYdX, which allows for decentralized trading of derivatives and other advanced financial products.

Overall, the best decentralized exchanges offer a high level of security and decentralization, as well as a variety of trading options and low fees.