preference on sling. qd swivels or old school swivels?

565fitter

Sergeant
Full Member
Minuteman
May 31, 2013
848
92
Washington, WV
ok i'm getting ready to order a tab sling and was wondering if there were any differences or advantages to either. the only 2 I see is quicker to take off the qd swivels. the other is the gun would lay across my back on its side instead of hang back scope down with the old swivels.

its going on my manners t5a

thanks guys!