I prefer the RPG over Carl Gustav for its successful and massive use since its production.
The RPG and its variants have been mass produced like the AK. All major parts are interchangeable in case of severe damage. It's a proven, cost-effective and deadly platform which has seen action in almost every major conflict of the 20th and 21st century.
Mostly common warheads used are HE and HEAT, and specialised warheads are available in illumination, smoke, tear gas, and white phosphorus variants.
Apart from its conventional AT and AP role, RPG has also been used somewhat as an Anti-Aircraft rocket, proven deadly for low-flying helicopters.
RPG-29 has also proven deadly against modern MBTs such as Merkava and M1Abrams.
The newer RPG-30 will take the newer generation of tanks head on with its unique ERA penetrating technology which was unveiled in 2008.