I think it depends on your play style/preference. I prefer hand cannons myself but I did just get another NITC that has so-so perks on it that's fully leveled that I also enjoy rolling with. But I do echo what others are saying about scout rifle perks to be on the lookout for if scout rifles are your thing. I would say the crucible machine gun is probably the most formidable heavy (similar to corrective measure), ldr sniper rifle from vanguard the best secondary, and the tfpwky (or whatever it's referred to as) hand cannon is my personal favorite primary (but I got mine as a drop with some really nice perks on it - not sure what the vendor version has). Hope this helps.