Best 15 inch sub for sealed box?

[audiohz 2]

Ok so I already have the box it’s 2.5 cubes net per sub. I’m trying to see what specs would be most important for sealed . From what I’m taking lower f3 is important. Currently looking at sundown sa15’s and incriminator audio lethal injection 15 . 

[bluedreamz 15]

Low Fs and high qts above .4 

[Aaron Clinton 2,372]

Have you checked out the SSA Gcon 15?