I think D'Addario strings do sound brighter on my acoustic guitars when they are new but I have to use copious amounts of fast fret to keep them sounding good. I use nothing but Elixirs on my electric guitars, they last much longer. I once thought Elixirs were prone to breakage but I changed the saddles (on a tuneomatic bridge) and that cured it. There are so many factors can affect string breakage.