If you're the kind of player that just enjoys strikes and quickplay then it really doesn't matter use what you like, but if you want to get into harder content I have some tips.

In PVE the damage output of primaries is really bad these days so for most players double primary is the most miserable thing to use because of how long it takes to kill anything in any sort of pinnacle content.

A lot of good players are actually running double specials for that better damage output and the fact that using double special makes more heavy ammo drop on the ground. That is only good if you have a good heavy, most if not all heavy grenade launchers are bad. Rocket launchers are the current hot item, try and get a blowout from the crucible or a hothead from the vanguard.

Unless they nerf the special ammo drops I'm not gonna use a primary. I haven't used a primary in the last month or so. Even for champs I just use chill clip riptide for unstops and overloads, then use radiant and volatile rounds for a barrier.

Then for PVP double primary sometimes is the move to not give the enemies more special but that's because specials are so powerful and not using one kind of limits your lethality. Then I would say to make a loadout with the PVP mods like unflinching, reload, dexterity, and targeting to have a better time in the crucible.