I only tried Tren one time and really didn't do a full cycle with it, because it was just way too harsh on my hairline. I had to trash it. Now, I was doing the Tren with Winstrol (winny) which may be the reason for the negative effect on my hair, regardless it's just too high of an androgen for me. I prefer Deca because of it's mainly overall positive effects and minimal harshness to the hairline.
As far as shutdown, I'm not sure which one is worse. You hear about the shutdown from Deca the most, but maybe that's because it's not a high androgen...who knows? Tip- always run Test with Deca, this seems to help.