In the past residential homes have 5 gutters and 2 x3 downspouts and commercial buildings have 6 gutters with 3 x4 downspouts.
Overall difference in water volume between 5 and 6 gutter.
Six inch troughs can hold twice as much water as 5 inch gutters.
If you want the best performance from your gutters and have a larger roof area then 6 gutters along with the larger 3 x 4 leaders downspouts are able to handle approximately 50 more water than a regular 5 gutter.
K style can handle more water than half round and a 5 k style can handle about much water as 6 half round.
To find out that is better the weight of the dimensions considered should be compared when both gutters are filled with water.
Also the steeper the pitch of the roof the more wind driven rain it will take.
Currently we are seeing more residents expand their downspouts to 3 x4 and some even install the complete 6 gutter system.
For those torrential downpours 6 k style gutter can handle a larger volume of water than 5 k style gutter.
Able to handle carry more water.
It means that the gutter will not be overfilled during periods of heavy rains as there is enough space inside the gutter.
But even among k style aluminum there is a wide range of choices mostly regarding thickness which ranges from 019 to 032 but also on finishes.
Six inch gutter will let the leaves and other debris wash right down the downspout with no need for covers.
In this round the 6 inch gutters.
Half round is also a lot more expensive than k style.
Now pay attention to the weight of the gutters.
It is important because the heavy weight of the water can cause the gutter to sag.
A larger gutter actually will hold more debris than a standard five inch gutter and is not self cleaning.
Pro s in having a 6 gutter system.