My favorite is the M1a:
But, bang for the buck, PTR91.
The G3 rifle design was innovative and created a simple, reliable rifle that could be mass produced cheaply. It did not make sense to the German designers, who lived through WW2 where entire German Armies were lost on the Eastern Front, to make expensive rifles that took a lot of effort to make. Take a look at some of the last ditch rifles being produced, crude, but still better than broomsticks. Given the losses in a major war, it made a lot more sense to cut production costs, and thus, the G3 type of rifles are still being made and issued while the expensive FAL and M14 are out of inventory.