lol good Q.... For me, deca shuts me down longer . Fina shuts me down harder but for a shorter amount of time. I go with fina because i get much more out of it.
I've done deca and tren together with no test and still had a ragin libido. I'd say deca would be worse though, as it's much less androgenic than tren and also has a much longer ester. Even with tren enth deca is still a good bit longer-acting, so it would likely kill the libido more while on it and keep you shut down longer when you come off. Glad I don't have to worry about that myself