The most used DEX for me has been Crypto Bridge followed by Forkdelta. I don't get enough support with Forkdelta though but  Crypto Bridge guys have provided support assistance when I faced a few node connection errors. Which is pretty odd considering CB is so famous. To me, they're the gold standard in DEX.

There are some cooler DEXs around but they don't have enough (and many times any) volume at all. So I wouldn't even name them.