IME tren is superior to deca and any other injectable for that matter.
Both are considered progestins but prolactin induced gyno was non-existent for me with tren, and far more noticeable with deca. I didn’t even touch an AI on 4-600mg TA/week.
Lost libido with deca around week 10 and took weeks to recover. Had to reach for my dick to make sure it was still there, it was so bad. As long as I’m running tren (with a test base of course), my libido is always up. It levels off after about 12 weeks and isn’t “raging” like it does the first few weeks I’m on, but still hyper-physiologic.
Pros for deca: had a good sense of euphoria, kind of like d-bol. That fuzzy feeling like you got before Christmas as a kid.
Cons for tren: tren cough. It’s like Russian roulette. You might pin 5 times and never so much as a tickle in your throat, then on number 6 your chest tightens up like a 60 year old man having a heart attack and you end up with your head in the toilet bowl hacking your lungs up, eyes watering, sweat pouring off your head. I usually have to lie down and stare at the ceiling for about 5 minutes afterwards to recover, then I’m good to go until next injection.
Gains seem cleaner and faster with tren. Deca is quite watery and I’ve never tried NPP so I can’t speak to that. Strength with tren pretty good, considering lack of sleep and I’m usually dieting when I’m on it so I’m lethargic for the most part.
So, for me it’s tren > deca hands down.