Uniswap was the first best dex used in Ethereum chain. When BSC chain start getting hype then Pancakeswap become very famous and was one of the top dex in bsc trend. Now so many new chain has been launched and every chain has own dex. I think Uniswap will remain best of all time and other dex will be just limited to some features/limited chains support. Blast2 or Manta could become a very good dex in the future but it could be short time trend also and nothing could be speculate confirmed.