heroic strikes, mostly. you might even get a blue Paradox from random caches, no matter what world your on, but its very rare to happen. Any kind of Crucible isn't a bad choice, either.
keep in mind, (kinda sorta spoiler warning if you weren't looking up what each verse gives you as a reward) Verse 10 is a sword (Future Safe 10 is it's name), and its another damn Adaptive Frame sword. So if you're already rocking a light sword at max power, i wouldnt sweat this one too much. i have a feeling they passed up a great chance to give us another heavyweight sword, since Crown-Splitter is the only freaking one I know about.