I never got muscle hardness from Deca. Deca and NPP have always bloated me, with not much to do about it. Yes muscle gains are nice from Deca and NPP, but not much my style any more. I like to stay muscularly hard and non bloated.
That being said, I really do like tren. It has become a staple for me. The side effects aren't bad for me. There are other things that give me worse side effects than Tren. Tren mostly gives me increased sweating at night, and it's not bad.
I always stack tren with testosterone. No libido or erectile problems.
Test/Tren has always done we well. Works for me really well on a restricted calorie diet as well.
Different compounds affect people differently. I've got tren cough only a couple of times out of many injections. Always happened when I injected to quickly. Stimulants give me insomnia, never tren. When I drop the stims, no problems with insomnia.
It's best to find for yourself what works best for you, and what you really like. Keeping consistent stable levels is key to mitigating side effects from tren and any other AAS.
Tren helps me a long with hardness, vascularity, strength, and LBM. I like the stuff.