What I know is my personal experience. Deca was great for me, test cyp was horrible. Deca was taken off the market in the U.S. years ago - we were all bummed, since it was so popular. Have you done Deca? If not, don’t deny the experience of people who have.
Also, you keep saying test, but not which test. They’re all different. As i said, cyp was terrible for me. I would never recommend that to anyone.