Pharaoh items can be very rare, some pharaoh items drop from other monsters (bosses) in game and can be easier to loot from them. Depending if you want to loot it from the pharaoh itself, you will need decent level/team to kill them with ease.
No pharaoh has the easiest loot/drop chance, they are all semi-equal in their loot chance.
Ashmunrah = Holy Scarab
Dipthrah = Pharaoh Sword
Mahrdis = Holy Falcon and Phoenix Shield (Shield easier to loot from The Time Guardian, forgotten knowledge quest)
Morguthis = Ravager's Axe
Omruc = nothing
Rahemos = Twin Axe
Thalas = Djinn Blade (easier to kill The Sandking from Cults of Tibia and loot, if have team)
Vashresamun = Ancient Tiara
Depending on your vocation, ek/rp can solo Rahemos with ease since it is weak to physical damage, this can be sometimes the easiest item (being able to kill it quickly to allow more times for boss to spawn)