Grenade Launchers, Underslung or Standalone?

Thought I would pose a simplistic question to get a debate going about the merits of underslung versus standalone grenade launchers for dismounted close combat.

A UGL mounted directly to a personal weapon

A member of 9 Parachute Squadron 23 Engineer Regiment keeps watch during the construction of the next phase of Route Trident in Helmand, Afghanistan. A digger is pictured moving the foundations of the road in the background.
A member of 9 Parachute Squadron 23 Engineer Regiment keeps watch during the construction of the next phase of Route Trident in Helmand, Afghanistan. A digger is pictured moving the foundations of the road in the background.

The same type of system but carried separately, with a lightweight stock and sight

The M320, a 40mm grenade launcher, is the replacement to all M203 series of grenade launchers on M16 Rifles and M4 Carbines. An interoperable system, it attaches under the barrel of the rifle or carbine and can convert to a stand-alone weapon
The M320, a 40mm grenade launcher, is the replacement to all M203 series of
grenade launchers on M16 Rifles and M4 Carbines. An interoperable system, it
attaches under the barrel of the rifle or carbine and can convert to a stand-alone
weapon

Multishot grenade launchers carried as the main weapon

M32 Multiple Grenade Launcher
M32 Multiple Grenade Launcher

Or the modern 20-25mm grenade weapons with expensive counter defilade air bursting ammunition

XM25, Counter Defilade Target Engagement (CDTE) System
XM25, Counter Defilade Target Engagement (CDTE) System

And, how about an older technology, rifle grenades, either bullet trap or blanks?

Have discounted the light mortar and tube launched systems such as the RPG, Carl Gustav or Panzerfaust for example although they might be seen as alternatives to the dedicated systems.

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