Underfolders look awesome!

But they such ass for shoulder firing!!!!

Triangle/Skeleton (Left) Side Folders (ie: AKS-74U) are much more practical, easier to deploy under pressure (or not), and far better cheek weld..., this considering underfolders have absolutely no cheek weld whatsoever!!! Hell .., those POS Romy side folders have a better cheek weld than the unders do!!!
Like I said...,
IMO..., underfolders look cool..., but functionally they suck ass big time!!
No contest, Triangle/Skeleton (Left) Side Folders RULE!!!
IMO:#1 Triangle/Skeleton Folder

#2 Ace Side Folder Folder
#3 Romy or German Side Folder
#4 Under Folder
As you see..., personaly an Underfolder would be my last choice!!!
But like
TheRedHorseman said: "definitely a matter of personal preference"