I can recommend the wc mk3
I dont have an impact yet - Waiting to see what the mk3 will offer....
Re the wcmk3 I bagged a bunny last weekend using a hades (mine is .22) at 45 yards, and I have lost count of how many woodies it has taken for me
Laser Accuracy 1cm groups at 40 meters.
The Impact has a few benefits over the WC:
1 it will giive you more shots per fill (bottle 480cc bottle versus 230cc tube)
2 Magazine holds more pellets - but I find a magazine of 18 is more than enough for hunting.
3 Adjustable butt pad
The pros on the WC are -
1 cased is super thin and short - very handy.
2 its is shorter overall than all but the Compact Impact
3 its got the Superior 500mm Barrel not sure if the uimpacts have these yet?
Mine has the DL power plenum - which enables the Saber Tactical weaver to be fitted and also save 20fps on the reg, and I converted the shroud into an extending one - this combined with a decent silencer makes it very quiet indeed.