I think Defis is a good project but compared to bitcoin investment it is risky and bitcoin is less risky because there were just so many investors when it comes to bitcoin. Defi mostly could fail in the process but I see a lot of Defi project gives a good amount of profit especially in just a short term of the investment. Defi is the new ICO here and investing in it was great in my experience but I guess you're just unlucky picking a good Defi token investment. If I have a good volume of bitcoin I will not exchange it for some token but if it was just a small amount I would take a risk since defi would give much more profit.
defi is risky because most of the projects that are related to it turned into scam. Defi is a fast paced project where you could earn and sell in faster way as well. You may be rich if you invested in a good one so you need to be sure that coin is legit and profitable, I earned 3eth in a certain defi project before and then after 3months the owner abandoned the project I am lucky that I sell it in the right time so good for me, if you will choose between defi and bitcoin? choose the more stable one choose bitcoin.