Six inch troughs can hold twice as much water as 5 inch gutters.
Overall difference in water volume between 5 and 6 gutter.
Six inch gutter will let the leaves and other debris wash right down the downspout with no need for covers.
The difference is about 50 of the amount of water treated by the 5 inch gutter.
Able to handle carry more water.
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.
In this round the 6 inch gutters.
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.
K style can handle more water than half round and a 5 k style can handle about much water as 6 half round.
In the past residential homes have 5 gutters and 2 x3 downspouts and commercial buildings have 6 gutters with 3 x4 downspouts.
Half round is also a lot more expensive than k style.
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.
With these systems a large load of water can overwhelm 5 inch troughs with their swifter flow rates.
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.
Now pay attention to the weight of the gutters.
Pro s in having a 6 gutter system.