In the most recent TWAB, they discussed a Fusion Rifle called the Loaded Question that you should be able to get starting next week. It’s a PvE ‘pinnacle’ weapon, sort of like Luna’s Howl. You have to do quite a bit of Strike/Nightfall stuff, but it sounds cool and doesn’t seem like a terribly time-consuming grind. There will also be a Gambit pinnacle weapon and a Competitive Crucible pinnacle weapon for the next season in addition to the fusion rifle. Honestly, you should just go for whatever seems the most fun. That’s what I do. Good luck!