Grenade Launcher, or Rocket Launcher?

I'm going to run Fallout 4 on Survival with the full official version of the game including the Creation Club elements that got added last month, and I wanted to focus on tactics I haven't used before. Decided an explosives build would be a good change of pace. I'll use a lot of thrown grenades, but I also plan to carry either the grenade launcher or the rocket launcher. The weapons and ammo are so heavy that you're probably better off using one or the other for survival, considering I'll be lugging along heavy grenades too. Besides, one gets bonuses from Rifle perks, and the other from Heavy Weapons perks, which is spreading things thin.

What are the pros and cons? Stylistically, I like the rocket launcher better, but it looks like the newer Chinese Grenade Launcher creation has serious advantages on stats. Just wondering how they compare overall, on ammo cost and shop availability. Also trajectory, range, targeting. I've just never paid attention to explosives. Would appreciate any advice!