Outlaw X6 - Wide Wrap for blokes with larger heads (me)
Outlaw X7 - Narrow Wrap ladies and gents with smaller heads, or if you prefer a really close fit.
The Outlaw A series are for Archery and have no nose grip. The Outlaw Arm has a split to grip your head behind the ear and up higher on the side of your skull. Panther series has a different frame design with a solid post across the forehead and joining the arms to which the lens is attached, whereas the outlaw uses the lens to bear the load and the arms hang off the lens.
Never tried a Panther but I guess the weight difference is minimal however from a practical perspective I know that the v large lens on the outlaw means I have to tilt my had back when wearing or it puts pressure on the bridge of the nose. Looks like the Panther has a smaller lens and is probably less intrusive. Hope that helps.
This is me wearing Outlaw X6 76HC lenses.
https://goo.gl/photos/2ZpeSmBCGYm3uknC8
Lenses are numbered based on % light transference hence those lenses allow 76% of available light in. Lower Number, Darker Lens.