In my opinion the best DeFi project in 2021 is Dia. I earned 45x in a week. I Can not tell you how much happy i am. I am not well expert in Defi but I think fabulous investment income. I am not also good researchers on defi field.
Why can Dia ? even though there are so many DeFi projects being born at this time, then why do you immediately say for 2021 even though it's still 2020, because if you want to make a prediction for next year, then someone has to do it for all projects that have been born this year, not just on a project that has given him the advantage that you said it was.