Weight
The G30 has an empty weight of 23.99 ounces and a loaded weight of 33.86 ounces (with a standard 10-round magazine). The G36 is a lighter gun with an empty weight of 20.11 ounces and a loaded weight of 26.99 ounces (with standard six-round magazine).
Dimensions
Both pistols are 6.77 inches long but the G30 is 1.27 inches wide, compared to the slimmer G36 with a width of 1.13 inches. The G36 is referred to as a sub-compact ̶0;slimline̶1; for this reason.
Line of Sight
G30 has a line of sight distance of 5.95 inches compared to the G36 with a slightly longer distance of 6.18 inches. The distance of a pistol̵7;s line of sight directly affects its aiming accuracy (the longer the distance, the greater the accuracy).
Magazine Capacity
The greatest difference between the guns is magazine capacity. The G30 comes standard with a 10-round magazine and has optional nine- and 13-round magazines available. The G36 is limited to a six-round magazine. The reason for the greater capacity in the G30 is that the magazines are staggered, meaning that the bullets are stacked slightly off-center (one more to the left, the next one more to the right). The G36 has single-stack magazines (placing the bullets directly on top of another); this design limits the capacity, but allows for a slimmer weapon.
Things to Consider
The G36 was designed for concealed carry--its slim design is less detectable--but at the cost of magazine capacity. The G30 was also designed for concealed carry but with its larger magazine is slightly bulkier and has a wider grip. Both of these guns are fine choices.