Both of these strings have the flatwound sort of texture yet they have more of that roundwound brightness, but i'm not sure which one i want to buy. 1. Do D'Addario Half-Rounds keep their initial brightness for a long time or do they lose their sound quickly? 2. Which one is overall brighter? If the Half-Rounds keep their brightness for a decent amount of time (like almost a year) then i'm totally going to get them. If they lose their sound after a week or two or even after a month, then i'll go for the Ernie Ball Cobalt Flats.