Traveling is easier, and you can pack two piece bows on your back if you would like, but I have had nothing but problems with multiple..multiple take down longbows from several makers. I have a Hill T/D now that is perfect, but still noiser than a one piece (just by a tiny bit).
So for the 5 or 6 T/D longbows of different makes I have owned, I would say that only 2 I would consider almost as good as a one piece. I will hopefully never order or buy another one!
The one I have is a T/D Hill with the sleeve I use for packing for elk.
From what I have seen, the connexion hinge is weaker when unstrung, but seems to be the best when strung and brace height is correct...The sleeve seems to be variable, some too loose, some too tight, some good. I prefer good to too tight.