An "All Round" Air Rifle Scope, Spring or PCP ?

[Blackrider]

Well so far, likely contenders are;
(Uttings prices)
Vortex Diamondback 4-12x40AO £260.
Nikon Pro Staff EFR 3-9x40AO £160.
Falcon Optics M18 4-18x44 SFP 30mm Tube £200.
Sightron SIH 4-12x40AO HFT Mil-Dot £260. (Not Uttings)

Note, I already have the Nikon mounted on a SFS Brum Longbow so I'm aware of its capabilities.
The Vortex is above my stated budget but I've seen one and I like it !
The Falcon sounds nice but I've never had a Falcon scope so that one's a mystery to me but it looks impressive !
All are Adjustable Objective apart from the Falcon.

I should add, apart from all the obvious requirements, the scope will be used on spring and gas ram air rifles and MUST be able to hold zero !