Good find Jumbo Jet bhai.
From the Traveller's point of view, Airbus A-380 is best, it offers more floor room, and more importantly bigger seats. We all know on long runs how important having a bigger seat is. While eating lunch, you have to be so cramped up and worry about not keep hitting the elbows of the passenger sitting next to you. With A-380's 1.3 inch wider seats than 747-300s, its a little comfortable and you have more leg room.
While from Operators point of view, Boeing 747-8l is better, it burns less fuel per seat, higher ROI (Rate of Return On Investment) and cheaper to operate per trip.
So, being a Traveller and not a PIA planner, I would prefer Airbus A-380. Ofcourse the CEO of PIA would be better off with going for 747-8l.
It all also depends on the Aircraft Maker's terms of Lease. If Airbus offers a better lease option, with less interest, than, A-380 would be a better buy. Let see what happens in next few yaers, as PIA is seriously in the market for new airplanes, to replace its currently aging fleet.