However, for Dex that is on a BSC network like Binance DEX the fee will be much cheaper by using the BNB coin as the main coin for fee payments. The fees used are very cheap compared to uniswap on the Ethereum platform.
Binance dex pass on the requirement OP is looking in terms of volume, it's volume now is at least $1 million _https://coinmarketcap.com/exchanges/binance-dex/
However, I believe Binance DEX is not really decentralized, there are a lot of countries not allowed to access the site as we can read on their TOS.
I guess Uniswap is always the best choice for now with over $1 billion trading volume.