Uniswap and 1inch. I have been using both of these since 2020, I am sure about this cause both UNI and 1inch airdrop happened back in 2020 and I was eligible for both of them for trading there.
I use UniSwap, but I don't think I've ever used 1inch even though it's quite famous in the market. If a new DEX doesn't have any special features compared to UniSwap, I won't have a need to use them. In the BNB chain ecosystem, I'm still only using PancakeSwap, in the Polygon ecosystem, I only use QuickSwap, and in EOS, I only use DefiBox.
DeFi is developing, but honestly, I'm not deeply involved like providing liquidity or exploring more utilities from DEXs. I prefer investing on CEXs, and DEXs are where I quickly swap tokens conveniently in a few special cases.