PCP will give more consistent shooting and better range. Less susceptible to summer winter and fast shooting loss of power.
The need for a bottle is a fag. You want 300 bar. If you want a compressor then get a cheapo chinese and just fill the tank on the gun, not the dive bottle.
If your benching, which I suspect may be so, then a 400cc bottle mag fed on bags or a pod will take 100% of the strain away if 5 cocking strokes tires you.
If your willing to spend, then something like an impact short/compact would be ideal. Quiet, big shot count, slick side lever and 100 yard capable.
An S200 but regged would be excellent to. You need the reg as the std cylinder will only take 45 shots in .177. Its small, easy to handle but mag system might need some tlc to get it running right.
The S200 barrel is excellent but the trigger tends to be weakest link in the chain. But accuracy can wipe mant a teutonic engineered FT rifle.
There are quite a few compact high capacity rifles out there but they cost.
Co2 would be last on my list but that rather depends what you really want re range and consistency.
In a battle of wits I refuse to engage with an unarmed person.
To one shot one kill, you need to seek the S. Kill only comes from Skill